Dec 2010 for BCV? those points are good for stays from dec 1, 2010 to nov 30, 2011.
in that case you can call today and book as far as 11 months ahead at BCV for jun 2010, if you are willing to borrow those points into your 2009 UY. if you borrow points into 2009, you could book a stay right now for as soon as dec 1, 2009 (if there is availability).
(be aware that when you bank or borrow points into a different UY, that choice is
final and cannot be undone - those points will then expire at the end of that UY.)
you might also want to read the
understanding UY thread.