I'm using Utorrent as well. I'm not sure if you're using a router, but if you are you shoud portforward it to get a better connection. So if you are using a routher, follow these instructions:
http://www.portforward.com/english/r...outerindex.htm
Now, for utorrent (which I find is the best one) you should go to Options then Preferences then Connection. Set your maximum upload rate to 0. This will allow unlimited people to upload from you. Since Utorrent is a sharing network, the more people that upload from you, the faster your download goes. However, if your computer starts getting too slow due to traffic, you can customize the amount of uploaders you want. Secondly, I would set maximum download rate to 0 as well. This will allow you to download many copies of the file from many different people. Same issue applies though. In addition to that, I always max out the 3 values in the "Bittorent" section of Preferences and the two values in the "Queueing" section. To do that I set them to 999. Again, this will make your Utorrent download faster, but might make your computer run slower.
If you want to use the recommended settings though, go to Options, then Speed Guide. Run the Speed Test and check what value you get for your UPLOAD rate (not download rate). Choose the closest number to that value in Connection Type in the Speed Guide.
Sorry for the story-long instructions. Hope it helps. And if you come to Mac, you don't have to worry about torrents at all! DC++ lets you download movies in seconds!