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Speed Download 4 is a great app. It works perfectly in Leopard too.

I have installed that. But I don't know how to use it. If I download something using safari, speeddownload will work. But I have no idea about how to use it to speed up transmission when I download a BT file.
 
I have installed that. But I don't know how to use it. If I download something using safari, speeddownload will work. But I have no idea about how to use it to speed up transmission when I download a BT file.

It won't help there, no application will. It will be down to altering settings in Transmission.
 
I use DownThemAll, its a nice Firefox add-on that I use to speed up big downloads. It can also do selective downloading of anything on a website (images, video etc...)
 
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