RazorLame is an front-end for use with LAME. LAME is a great MP3-Encoder: it's very fast, it produces high-quality files, has many advanced features (like Variable Bitrates and Joint-Stereo), and it's open source. Unfortunately, it is a command line utility, and that is where RazorLame comes in: It provides an easy-to-use graphical user-interface which makes MP3-encoding even easier!
Download RazorLame v1.1.5