"TripConnect allows you to get travel advice from a network of friends and others who share your tastes and interests." (from their website)
TripConnect started up in September 2006 and seems to being going strong. It is another social travel website, like 43places.com and Wayn.com. Like those, and others, TripConnect alows members to list, review and blog about places where you have been, and asking others members about places you want to go. TripConnect also allows you to suggest and join special interest groups (see the image above), which is less common elsewhere -- though others may also have added since the last time I looked! It does seem to be lacking a map interface, which is something that is really well done on the VCarious.com website.
Personally, I found TripConnect to be simple and straightforward - and that alone can give it a considerable advantage in the growing world on social travel websites.