Here's a link to a review website that asked just that question.
WikiAnswers is not really a writing critique site. I have linked some good writing critique sites for you below - also, some Related Questions about how to edit and critique your own work!
www.mdjunction.com/bipolar and www.findthelight.net are two well-respected bipolar support groups.
Some of the best online fitness support groups are: Weight Watchers, Jenny Craig, eDiets, The 50 Million Pound Challenge, The Biggest Loser Club, and DailyStrength.
There are quite a few of them, actually there is a great deal of on-line writer/writing sites. Here are just a few: urbis.com; fictionpress.com; writing.com/
There is no shortage of websites that offer exercise tips online. Some focus of particular muscle groups, other on more general fitness. The Helpguide website is a good place to start.
You could use any of the million dating services online. These dating services include those geared toward professionals, millionaires, specific religious groups, racial groups, and some that include everyone. Eharmony and match.com are good sites to begin with.
Yahoo groups, Google groups and Facebook all have groups devoted to blacksmithing.
Yes, some good photo sharing groups include Dot Photo and Web Shots.
The best place to get free help is to use advance readers(sometimes called "beta readers"). These are people who will read your work and tell you what they think about it. Some readers will just check for grammar and spelling errors, while others will look for logic problems, characters who don't work out, and plot mistakes.You need to find people who can be readers - friends and family may work, but remember that most of them will not want to hurt your feelings, and might not be honest if your writing isn't working. One good place to find readers is in a local or online writing group - check your local newspaper to find groups where you can take your writing and pass it around in person, or search online for writing critique groups. Be aware that some groups are better than others - click on the Related Question to learn more about writing groups and workshops.
Some of the good google groups include the health group, the business group, the news group, or the money group. You might also find interesting the recreation or the sci/tech groups.
My wife wants to buy some new kitchen flooring. What are some good online stores to buy this from?
Here's a great website that has a ton of choices for you!