Eh, that was annoy the heck out of me. I'd change my myspace to private and just delete his "fuzzy" comment.
And watch to make sure it really wasn't him driving by your house! That is weird..

something kinda the same happened to me... I got married a couple months ago and my exboyfriend all the sudden started writing me (also on myspace) he flirt talked, and i just never answered (here i have to say we broke up because he started being really freaky and tried to control my every move. he also lied more or less about everything that was going on in his life, and as we broke up he kinda started stalking me, but then i moved back to switzerland, now i'm in the US again, in the same area..)... all the sudden he called me up (dont ask me where he got the number because i got a new cell phone) because he wanted to go to parties with me... I was really weirded out and told him straight up (but not rude, just honest) that i didnt want to hang out with him, and my husband wouldnt be too thrilled about that either... i told him i he shouldnt contact me anymore...
well honestly he still writes me emails on myspace, but i dont ever go there anymore so it doesnt bother me. just make sure that your wife didn't put her address on her myspace accout (because if she did that might be the reason why he (maybe) showed up). I agree that she should make her account private

omg get rid of freaking myspace
its just drama
block it from your computer

Hey myspace is cool, I met my boyfriend there and I found a long lost relative there too. But yea she should deffinately put her account private. I recently had an ex contact me thru it so I had to put it as private and everthings fine now.
Jus keep your guards up and be careful, lock your doors and stuff if she says she saw him pass by.

Sounds like an emotional "booty call", as my sister puts it. He's probably just lonely and is reminiscing. Great signal, though, that your wife is sharing these details with you. Work with her to come up with a solution together about how to deal with it ... and ask her to continue sharing and being honest.