Aimster is cool. Download here and see the screen shots of it and see the benefits of switching over. So far, after installing, it is stable and downloading nicely. I have emailer on, netscape browsing and Aimster is just doing what it should in the background.
http://www.aimster.com/mac/tutorial/
for FAQs
http://www.aimster.com/mac/faq.phtml