It's still playing. Hannah Waddingham (as Lady Of The Lake, originally played on Broadway by Sara Ramirez) and Clay Aiken (as Sir Robin The Chickenheart - originally played by David Hyde-Pierce on Broadway and by Eric Idle in Monty Python & The Holy Grail, on which Spamalot is based) just left the show (May 5) so there were a couple new cast members who came on board in May, but the show was going strong in late Jan., Feb., March, and April and seems to be continuing successfully.

I didn't get to see it but I have several friends who did and they say it's a hoot.   It's completely silly, of course. ; )