This is the official page of the free program ogg2mp3. It is a simple Python script, and I am not a Python expert, so don't expect much from it.
Since ogg2mp3 is free software, you can download, use, modify and redistribute it to your heart's content, with some caveats (see license). If you would like to share your corrections/additions with me, I'd gladly hear of them by e-mail.
Basically ogg2mp3 transcodes Ogg Vorbis files to MP3 and/or the other way around. It reads the ID3 tags from the source file, and puts them into the output file, if possible.