I hope you're wrong about that. I haven't heard a
peep, received anything in the mail or seen any
mention at any website of a 'recharacterization'
deadline. I'll know Monday.

I think you have until 4/15, maybe after if you file an extension.

The reason for 4/15 is if you converted in 1998 and found out in 1999 that you were over the 100,000 cap you have to convert back before you file your return. Look at IRS pub 590 and see if that helps.