Counting to Five
Here is a link to a terrific post by Tom Goldstein that raises two very interesting points:
1. The Court could vacate and remand Perry for reconsideration in light of Windsor (the DOMA case). That would not resolve the standing issue, but would allow the Justices to dodge the issue.
2. If Justice Kennedy did not vote to grant certiorari, voting to dismiss the writ as improvidently granted could be contrary (at least in spirit) to the rule that you only need four Justices to vote yes on certiorari for the Court to hear the case.