AntidisestablishmentarianisticCould I be this?
Probably add more to this post later...
For now just know that this is the longest word (30 letters) that I have come across from memory.
Actually read something that said the 'ism' version of word was longest, so I added istic (2 more letters) Just did a search and sure enough...
Urban Dictionary - Antidisestablishmentarianistic
Let's hope for and make 2009 the best year ever!