I use Github primarily to report crashes and issues that aren't addressed on Minecraft Forum.

I used 350 mods (I know, it's a lot) including Single Player Commands 5.2.2 and Optifine Ultra D1 on my 1.6.4 client, using MultiMC5 with 10GB of memory usage.

http://pastebin.com/P96a8xm8

Duplicate of #5