I like brainstorming questions like this. :)
* If you like your lamb haute, Insieme has a delicate "Elysian FIelds Lamb" dish with cauliflower, romanesco, pine nuts and currants (unclear why it's so named... perhaps so you know you're not getting live lamb?)
* Best lamb burger is probably at Anthos.
* Milos had an excellent lamb chop last spring (the first and only time I had it)
* For something more low key, Akdeniz's version of hunkar begendi (lamb over smoky eggplant puree) isn't too shoddy.
Insieme's lamb dish is the most interesting (to me); the Anthos burger is the most satisfying on a cold Nov. day if you're hungry.