Though the internet's own "Om nom nom nom" is inexplicably missing, this nifty comic of the International Sounds of Eating by James Chapman of Champmangamo (previously on Neatorama) is still pure blogging candy to me!
In this panel, Chapman explains that the sound of eating of "chomp" to English-speakers have various foreign language equivalents (cross-linguistic onomatopoeias, if you want to be technical), including "paku paku" in Japanese, "chrup chrup" in Polish, "nyam" in Korean, "miam" in French - and my favorite, "mampf" in German.
If your language is not in the comic, do tell us what eating sounds like in your native tongue.