1 Coupon Stop (coupon codes for online merchants)
www.1couponstop.com/

AllWatchers (opinion site for books and films -- over 670,000 in the database to help you refine your entertainment choices)
www.allwatchers.com/

Anything Left-Handed (for lefties everywhere)
www.anythingleft-handed.co.uk/

The Anti-Telemarketers (find out how to keep the telemarketers from ruining your dinner or your credit rating)
www.antitelemarketer.com/

Appliance 411 (go here when your appliances break down if you want to know how to fix them yourself)
www.appliance411.com/

Baddealings (post complaints about businesses)
www.bbbonline.com/

Better Business Bureau (online presence of the famous consumer watchdog organization)
www.bbb.org/
and www.bbbonline.com/

Better Business Bureau's Wise Giving Alliance (watchdog site for info on business practices of charities)
www.give.org/

BizRate (comparison-shopping tool)
www.bizrate.com/

Car Talk (online presence of the Tom and Ray Magliozzi radio show -- lots of information and entertainment about buying autos)
cartalk.cars.com/

CarClub (find out info about new automobiles)
www.carclub.com/

Carfax (fee-based service providing info about used cars -- you'll need the VIN)
www.carfax.com/

Crash Test (find out crash-test info on most automobiles on the market)
www.crashtest.com/

Complaint Book (forwards complaints to businesses)
www.complaintbook.com/

Complaints.com (maintains a large archive of consumer gripes, from balky PCs to cruise ships from hell)
www.complaints.com/

Consumer Products Safety Commission
www.cpsc.gov/index.html

Consumer Reports Online (the Cadillac of consumer advocacy groups, but you have to subscribe at $4/month to use its services)
www.consumerreports.org/

Consumer Search (lots of product comparisons)
www.consumersearch.com/

Consumer Sentinel (FTC site offering statistics on consumer satisfaction)
www.consumer.gov/sentinel/

Consumer World's Consumer Agencies and Organizations (many links to private and public watchdog groups)
www.consumerworld.org/pages/agencies.htm

ConsumerReview (portal-like site that links "communities" of enthusiasts of amateur reviewers)
www.consumerreview.com/

Current Codes (good place to find coupon codes for online stores)
www.currentcodes.com/

Edmunds (very good site for comparison shopping for automobiles; get wise before you visit your local car lot)
www.edmunds.com/

ePinions (again, a site mentioned elsewhere, but featuring a strong base of consumer reviews)
www.epinions.com/

EShop (compare product specs and prices online)
www.eshop.com/

Fantasy Stock Market (practice your investment skills before venturing out into the real market)
www.fantasystockmarket.com/

Federal Communications Commission (go here to report phone-based scams)
www.fcc.gov/cib/ccformpage.html

Federal Consumer Information Center (home of the Consumer Action Handbook)
www.pueblo.gsa.gov/crh/respref.htm

Federal Trade Commission Consumer Protection (lots of info and an online complaint form)
www.ftc.gov/ftc/consumer.htm

FinanCenter (good place to plan out your finances)
www.financenter.com/

Find-It! Consumer Site (consumer info from a variety of sites)
finditconsumer.wa.gov/

Foundation for Consumer Rights www.consumerwatchdog.org/

Froogle (Google's new shopping service)
froogle.google.com/

Gas Price Watch (enter your ZIP code and find out how much fuel prices are in your area, as well as best and worst price comparisons)
www.gaspricewatch.com/

GE Center for Financial Learning (site devoted to "promoting financial literacy;" it claims not to be a commercial offshoot of its sponsor, GE)
www.financiallearning.com/

HomeScape (rental and buying info on apartments and houses across the US)
www.homescape.com/

Hot Deals Club (online deals)
www.hotdlz.com/

Insurance Institute for Highway Safety (good source for stats and info on car safety)
www.hwysafety.org/

Internet Fraud Complaint Center (joint venture of the FBI and the National White Collar Crime Center to get complaints about online fraud and follow them up)
www.ifccfbi.gov/

J.D. Power Consumer Center (great place to get info about buying your next automobile, buying a new home, deciding what health care provider to use, etc.)
www.jdpower.com/cc/index.html

Junk Faxes (what to do to prevent them, how to complain about them, etc.)
www.junkfaxes.org/

Kelley Blue Book (find the value of your used car)
www.kbb.com/

Lasoo (map-based search for businesses by category)
www.lasoo.com/

Make The Move (when you move, let this site handle all of your mail forwarding, utility transfers, and so forth)
www.makethemove.com/

My 3 Cents (forwards complaints to vendors)
www.my3cents.com/

National Consumers League (consumer action megasite)
www.nclnet.org/

National Fraud Center (fraud-avoidance tips and timely alerts)
www.fraud.org/

National Highway Traffic Safety Administration (great source for info on car safety, including specifics on individual models)
www.nhtsa.dot.gov/

Original Tipping Page (go here for tables and info on tipping)
www.tipping.org/

Planet Feedback (if you post a complaint on their site, they'll forward it to the offending company)
www.planetfeedback.com/

Productopia (consumer reviews from both experts and users)
www.productopia.com/

Realtor (nationwide home listings)
www.realtor.com/

ReviewFinder (lots of online reviews of various products)
www.reviewfinder.com/

Savings Bond Calculator (find out the current worth of those savings bonds)
www.publicdebt.treas.gov/sav/savcalc.htm

Search Bug (track parcels from FedEx, UPS, etc)
www.searchbug.com/packages/

SpringStreet (find apartments nationwide)
www.springstreet.com/

The Squeaky Wheel (consumer complaint site)
www.thesqueakywheel.com/

UGetHeard (similar to ECaveat)
www.ugetheard.com/

Web Police (targeting international Internet crime)
www.web-police.org/

WebGuardian (good place to file a complaint on an ISP or an online vendor)
www.webguardian.com/