I was reviewing a number of our previous projects (some more successful than others) and was reminded of a post from Joshua Porter titled, "Seven Reasons Why Web Apps Fail."  Joshua wrote the post almost a year ago and I thought it was worth repeating the reasons.  Check out the full post here.

• Too focused on social instead of personal
• Try to do too much, or solve too many problems
• Working hard to make someone other than the user happy
• They sell it the wrong way (i.e. focused on Ajax, tags, web2.0, soa)
• Not built to last, exit strategy is too obvious
• They show too much of what’s going on, and get gamed
• Their underlying business strategy does not improve people’s lives