New bittorrent protocol to enable speed throttling.

http://www.techreport.com/discussions.x/17881

They say not much of an impact on download speeds but upload speeds will be affected, hope it doesnt screw our narrow band ISP's here

^ this was available from last year itself from utorrent version 1.7 i think.

see this: [uTP] besides IP address in utorrent peer list ??

edit: i have used this uTP protocol continuously for more than a month. main problem is if the other peer has not enabled the uTP protocol your torrent program will seed or leech in TCP-IP only.
Also no effect on upload speeds. infact most times the upload speed surpases the set speed by 3-5 kb.

so upgrade to utorrent 2 or no ??

2 is in beta yet. as usual beta version have problems like crashing or loosing files as seen in the forums, so best to get the latest stable release.

you can enable utp in current stable version (1.8.5) also if you want.

Also some beta versions are not supported by some trackers and the id using it may face a temporary / permanent ban. IPT lists all the allowed and not allowed torrent clients for its tracker.

I've been using utorrent 2 since it was in alpha as 1.9. Best part about it is that when TCPIP traffic starts (such as regular web browsing) the downloading speed automatically gets throttled even if the TCPIP traffic is from some other machine on the LAN. This function is working beatifully. Earlier I had to use cfosspeed but that wasn't very effective.

However the latest build keeps crashing on windows 7 x64. So I've temporarily gone back to 1.8. I hope there's a stable release soon.