Hi Allan and List,
Sorry if this already exists, but I didn't find a way to do this with the current beta. If I fire up TextMate (or activate it, because it runs all the time) I often just do some normal writing of text. For this I have a basic highlighting which just highlights URLs. But in this situation (after pressing command-n) there is no highlighting activated.
I would be very pleased if there could be some preference to define a default highlighting which gets applied to new files or the ones without a defined highlighting so that I not always have to adjust it from hand to see blue URLs. :)