I was talking to some co-workers recently about what works and what doesn't as far as platform technologies on the Internet.  Why did something like WAIS and FTP die out but http and RSS succeed?    The answer is not 100% clear to me... So I am coming to you!

I am gather a list of failed Internet technologies and why.  I want to include both MS and non-MS technologies.  Please comment on this post or send me an email. 

thanks for your help!

Update: As many early reader's commented, I think FTP is a really bad example of what I mean here. Not only is it still in use today, but it had a heyday, when it was mainstream. 
What I by "failed" is ones that never really took off... So think of IE's Channel's concept as a good example.