Where's Bush?

Does anyone else think it is odd that Bush seems to have fallen off the face the earth?  With the 9/11 revelations and the Iraq problems, surely it can't be in Bush's best interest to hole up in Crawford.  Of all possible times Bush chooses now to go on vacation?

I'm not the type to normally suggest this but does anyone think something is seriously wrong?  Did the guy have an anxiety attack?  Has he fallen off the wagon?  I just find his absence very odd.