Well, I am afraid the TODO will have to be Ruby 1.8 (i.e. Tiger or custom install of Ruby), cause this isn’t easy to replace -- easiest would be just to include erb in the Support/lib folder, but I don’t know how much is to erb though.
Oh, I'm sorry for this. This was actually one of the first things I have done with ruby and when I discussed it with Allan shortly in IRC using ERB seemed a good idea because it separated the html template from the actual source.
If you delete the bundle by hand though (and ignore it at svn checkouts) you can still use the old command which is included in TextMate 1.5
Soryu.