WinMx seems quite good.
However, there are still regularly 3.5 to 4 million people using K Lite. My daughter has filled nearly 8GB of my hard drive with stuff from K Lite; mainly weird cartoons like Invader Zim and Cowboy Bebop (or something like that) but also lots of music too. It still seems to be working fine.
Are there plans to take it down like Audiogalaxy?