Tunneling app-specific traffic

Is there any way, in windows xp, to force application(s) X to use a specific network card other than the default, or use a third party app to force the app into doing so?

I'm asking because I have access to two internet connections, one wired and one wireless. The wired is a fairly fast DSL-connection that has shitty upstream-speeds while the wireless has crap downstream but great upstream. So I'd like to have my torrent-client use the wireless so that I can seed shit at more than 700kbps while still being able to browse the web, play games and download (http/ftp) at decent speeds through my wired connection.

Any ideas for a solution?

So... are you leeching off someone else's wireless, or what?

>>1

Send the app through a local socks proxy that has the option of selecting which connection to use.