Phils' bullpen is a bit thin right now, especially with Wagner hurting, so the deal does make sense for them. Financially, he's got a 3.15 mil. player option next year, so that isn't the greatest.
Beyond that, Simon's a pretty intriguing prospect. Sounds like he has good stuff, but is wild. If he can be tamed/harnessed, he may turn out good. Ledee's crap. Why do the Giants want him, too? Quality>quantity. You can't start ten crappy guys in the outfielder.