In the 9309 release of TM2 the placement of the html output window is broken. The placement on the right does not work anymore.
The command
defaults write com.macromates.TextMate.preview htmlOutputPlacement right
does not work. I'm only able to change to a separate windows, i.e.,
defaults write com.macromates.TextMate.preview htmlOutputPlacement window
All the best
Guido