Play: The Lehman Trilogy. Runner-up: The Hills of California
Any Musical: Sunset Blvd; Runner-up: Merrily We Roll Along
New Musical: The Outsiders; Runner-up: Moulin Rouge
I include the 'Any Musical' category because the productions of SB and Merrily are so different from the original as to be almost new musicals; also, because no new musical in this decade comes close to those productions for me.
While I loved both The Outsiders and Moulin Rouge, the decade thus far has been pretty mediocre for musicals.
Yeah, this is really making me realize that the times of things like My Fair Lady, Candide, Most Happy Fella, Bells Are Ringing, Lil' Abner, all premiering the SAME year, are far from over.