In case you haven't heard, the people at Scrubs are at least informally talking about having characters from Arrested Development as patients - at least according to Zach Braff (via the Ausiello Report at tvguide.com).
Ausiello: What's this I hear about David Cross coming on as his Arrested Development character?
Braff: That's what I'm trying to broker. I'm a huge fan of his and so is Bill, and our idea was that he would play Tobias in an episode. Obviously, we have to get that cleared by a lot of people, like [Arrested creator] Mitch [Hurwitz] and Fox, but that was my pitch. David wants to do it.
Ausiello: Is it your goal to get the entire Arrested Development cast on Scrubs?
Braff: [Laughs] Yeah, one by one. I was such a fan.