wxLame!

LameXP is an Audio Encoder Front-End, a graphical user-interface for a number of audio encoders. It was developed to support a huge number of input formats. File formats are detected reliably using MediaInfo. Compressed audio formats are decoded to uncompressed Wave files using suitable CLI audio decoders. Furthermore LameXP allows batch processing of multiple audio files. Multi-threading is implemented by processing several audio files concurrently. All the third-party tools incorporated in LameXP are listed in the "About" dialog. The Nero AAC encoder cannot be redistributed due to licensing issues; it is available as a free download from the public Nero web-site. »

winLAME is an encoder for several audio formats, including mp3 (MPEG Layer 3), Ogg Vorbis and more. winLAME lets you set up the encoding process with an easy-to-use wizard-style user interface.

LameDropXPd is a practical frontend for LAME that makes things easier to the user, as there is no need to know about command line usage: most LAME settings are reachable on a graphical interface. Besides encoding WAV files to MP3, it can transcode Ogg Vorbis files, decode MP3 files to WAV, and auto-tag the files it encodes.

[No longer maintained, but downloadable] ALL2LAME is a free Windows front-end for the LAME MP3 encoder. It's very easy to use: