first, allow me to be pedantic: running Shareaza under WINE isn't porting it. It's... Well, it's running it under WINE. "Porting" would involve changing all the code to use common Linux toolkits and such, and nobody is doing this (because starting from scratch is probably easier).

Now, there has been a guide in the Shareaza wiki to make your life easier for a while, and it's here. It should be easy enough to follow for anyone that's a little familiar with both linux and Shareaza.