Fist of teh Internets.
But man, it's a great property.
If it wasn't for the fact that the team is based on so many superpowered individuals and the special effects budget would be crazy (well for my wision anyways)...I'd say the book is ripe for a TV adaptation. It'd be perfect for ABC or FOX. Had it been released like 2 years ago...it'd have been a great "answer/response" to NBC's Heroes.....but with it's low ratings---Heroes isn't much of a contender.
But if released now, so long as it keeps the format from the comic---Thunderbolts would be a welcome change from the monotony of Heroes' stagnant storylines.