My only solution is to put onesies on him all the time so he cant get to his diaper. But I only have 5 onesies, I don't really like using them anymore, hes kinda too big for them. Usually Bobo tells me when hes poopy but this morning he didn't (this is not the first time hes done this). I was down stairs cleaning, he was playing in his room. When I went back upstairs I first smelled it, then found his disgusting fingers that he had stuck down his diaper. EWW!! I want to gag just thinking about it. I have of course cleaned and sterilized the toys he had been playing with... I think its definitely time to start potty training.
3/4/10 UPDATE: Even in a onesie he still manage to get his hand into his diaper. So, I put PJ pants on him (or any pants that fit snug) and then put the onesie OVER the pants. He looks silly but it keeps him out of his diaper. Luckily he does not know how to unsnap the onesie.
I have been encouraging him to sit on the potty, not a lot of luck yet.