I dont know if this the right forum to post this in, but anyway, I think that limewire should use java 1.4 because of it optimizations. Like VersatileImage and the NIO classes. This could probably greatly improve the performance of LimeWire. I think also that you should use skins. Which is very easy to accomplish with Swing, but you probably already know that. It would be nice to be able to choose the Swing LnF or the one of my operating system, or even a self created LnF . I also think that LimeWire should create something as communities, where people with commen interrest can share information. And chat easily with each other. The chat is really a thing that should be improved, you should be able to do it the iRC way (perhaps an idea here).

Anyway, its already a great program. But dont get lazy, a lot needs to be improved