LAME mp3-encoder was designed as an open-source application for many years and now it's the best mp3-encoder ever!
LAME gives you the best possible quality/compression, provides lots of function and works very fast. The original LAME mp3-encoder is aviable from the official homepage (www.mp3dev.org), but it's only aviable as a console-application. Such console-applications are very flexible, but most users prefer to work with GUI (graphical user interface) applications.
LameXP is a GUI for the LAME mp3-encoder, that makes it much more comfortable to use LAME. Using LameXP is very easy, because the user-interface has been desingned as simple as possible and it uses the new WindowsXP* style.