There is a beta version of the upcoming 1.0.1 release with several bug fixes and small feature inclusions. Normaly, TextMate doesn't check for beta versions with the automatic version check system, but if you wish to have it do so you can type the following in your favorite shell:
defaults write com.macromates.textmate OakCheckForBetaVersions 1
..and 0 to disable beta check again of course. When starting TextMate the first time after download, a window with release notes will automatically open to show you the latest changes additions and bug fixes. Have fun :-).
PS: If you for some reason can't get the beta version from within TextMate, the URL is: http://macromates.com/textmate/files/TextMate_1.0.1b1.dmg