If You're Still Going Through Harry Potter Withdrawal
Clevver News (yes, the double V is intentional) does a pretty thorough "Where are they now?" regarding a good selection of the actors. Although much of this isn't surprising, it's nice to have it all gathered into one video:
Here's one that wasn't included: Daniel Radcliffe in the upcoming Horns, based on the book written by Joe Hill. That is, I believe, Radcliffe narrating. I think he did a pretty good job of recreating an American accent.