There are currently 1374 bets that have been confirmed which haven't had their payouts confirmed yet:

http://pastebin.ca/2262402 (it's too big to include in this post - I never hit the 64000 byte post size limit before)

It looks like SatoshiDice is being swamped by thousands of tiny bets which they're not able to deal with in a timely manner.

The blockage was probably initially caused by a double-spend attempt, which can have a large knock-on effect:  when you make a transaction using a double-spent bet as an input, all the outputs are doomed to never confirm.  Each of the transactions which you subsequently make using any of those outputs are also doomed to never confirm.  And so on.  Before you know it you have a huge tree of payouts which eventually just vanish because they depend on a double-spent bet.

Eventually some kind of a clean-up script will run at SatoshiDice and all the missing payouts will be redone.

It kind of sucks that you're having to wait, but you're not alone...