Short answer. If you are already using a high speed connection. ie Not dial-up, then there is probably nothing you can do to increase download speed. The bottleneck is likely at the other end or somewhere in between and you can do nothing to affect those areas. Of course if you can convince the millions of other torrent users out there to lay off for a day you might just see an increase in your own download speed. Good luck with that.
You can make sure that you have UPNP enabled in utorrent and your firewall and your router. There is an option in utorrent to check the connection. Some isps throttle torrent connections by injecting kill bits into the torrent streams. You could try using protocol encryption for both inbound and outbound traffic. This will stop the isp from being able to detect what kind of traffice if being used which may increase your speeds if its very bad. Are you using wireless? Is your bandwidth good otherwise? If your line is erroring alot, your woudnt notice it when viewing web pages but it would certainly hurt downloads
Well I used to use flashget before realising that it was a steaming pile of **** There were options in the bittorrent section simply saying protocol encryption. I am using utorrent now and well this will say it all for you:
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