Is it wrong to go with the obvious answer?

He's got a movie coming out to start off the summer big giant blockbuster season. He's in a dozen books a month and thats only going to get worse (or better depending on your perspective) as the movie approaches. 

I'll make the safe bet and say Wolverine makes more appearances in more comics than any other character in 2009 and his movie pulls in more cash than any other comic movie except for possibly Transformers 2: Attack of the Bad Director.