If Bearshare can be configured to work through a proxy you can use SocksCap32 and HttpTunnel to tunnel the port 6346 through port 80. I have tried it with Napster and it works, no luck with Limewire due to a missing option where to specify any proxy at all.
Just tell me if you don´t find those programs and I´ll send them to you, but a yahoo search will do the job, it did for me.