Da'Sean was just released by the Heat, who needed to trim down their roster. He's still rehabbing from his injury, but his game was never really predicated on great athleticism and he presumably is still a talented player with potential.
If we're a ways into the season and we don't need Von Wafer anymore once Delonte comes back, I'd be intrigued by the idea of picking up Da'Sean, if he hasn't been picked up by some other team by then (he most likely will be). If it weren't for his injury he would've gone in the 1st round.