Someone will eventually give him a shot. Personally, I don't think he suits any other position on the field other than quarterback.
He was an average quarterback with running skills not ever seen before, behind a horrible pass blocking offensive line and young, immature receivers.
Had none of this happened, I actually think they would have definitely had something with Bobby Petrino. Unfortunately, both situations went to shambles.
Like Jamie Dukes said on NFL network, I don't think it'll take him too long to get re-acclimated to being an NFL quarterback. I personally think if he went through an off-season of Mini Camps followed by training camp and a couple pre-season games, he'd be ready to go. So, if he's a backup quarterback for the 2009 season (practice time, scout team, etc) followed by all those activities, I think he'd be back.
Harry does make a good point however, regarding the media circus it's going to cause and putting uncertainty into the starting quarterback. That's why I think whatever team he goes to, there
has to be an established quarterback, or a reason that everyone knows why he'll be in the game ahead of Vick.
Take Oakland for example. If Vick signs on, Al Davis is going to say "JaMarcus Russell is our quarterback, no matter what happens. After taking him with our 1st overall pick, he needs time to develop." Eventually after a couple weeks, everything is going to die down. Especially if Vick shows that he's remorseful for what happened and maybe does a big time interview with ESPN, NFL Network, Oprah, blah blah blah, to help repair his image.
Besides, if a starting quarterback struggles for a couple weeks on ANY TEAM, when is there not controversy?

Anyways, it's anyone guess what happens. But I don't think he's suited for any other position other than quarterback full time. Maybe in a Wildcat situation once or twice a game, but that's about it. It would be an even bigger adjustment at this time switching positions to a wideout or a running back than it would him staying as a quarterback. He's never played those positions in his life. He's been a quarterback the whole time.