I just found out about two new (to me) compressions: water cells -> snow balls and snow balls -> ice blocks. I can use the recipe book from Risugami to find bench recipes. Where can I find all the compression "recipes"?
Barring decomplieing source code and getting told by others, there is no way
Edit: Al has a fetish for forcing ppl to figure as much out by themselves as possible, so don't expect anyone to leak any "secret" recipes without him sending over a swat team to trash their computer
Get every single Minecraft item, and manually insert them one at a time into Compressor. Once the compression bar starts to light up, bam that can be compressed!, and so on. you get the point.