[jdm]

Oops, I forgot to include zShare in the above list:

http://www.zshare.net/

It's another good one and virtually unknown.

[CarrotAndStick]

I just tried ZShare, and it is amazing! No sign-ups needed, and it uploaded a small 2 mb file at all available bandwidth, on my DSL connection(at around 2mbps).

Thanks!