Sorry to bump an old thread, but I was going crazy trying to find an updated Biome ID list. I couldn't find one anywhere, so I decided to generate my own. If you are looking for an updated list, I have 1.7.2 here: http://www.minecraftforum.net/topic/2768519-the-ultimate-biome-id-list/
And I may even keep it updated with 1.7.4 1.7.9 and 1.8 when it comes around. At the very least, I will publish a YouTube Tutorial on how to get this list yourself without Eclipse or any Java knowledge.