Limit bandwidth per application

Hi there,
I am looking for a way to limit bandwidth per application under Mac OS X Lion ; either with a dedicated app or Terminal command.
I didnt find any tools with Google or App Store : does that mean "limiting bandwith" is a *bad* idea ?
The purpose is mainly to limit iTunes !
Thanks for advise.

I found a way to do this. It's a bit roundabout but it works. Rather than limit per application, you limit per server. For example I notice adobe creative cloud usually takes over my entire network connection when it's uploading a file to the cloud server, making it a pain to even browse the internet when it's sending a large file. Using little snitch's network monitor I see it's sending data to "creative.adobe.com", I enter that server into a program called speedlimit and set how much data it should send to that server. Fixed.
little snitch:
http://www.obdev.at/products/littlesnitch/index.html
speed limit:
http://mschrag.github.com/

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