Entertainers.
I think the new introduced types are cool and nice, but it is awkward to set them.
If you hit a tile, your people switch back to entertainers. Switching them to civil engineers e.g. is a tedious task.
The Governor, I use Governors in the late game, does not use them at all, only taxmen and scientists.
I would like a better governor or a better way to reduce MicroManagement in Civ4. Till I get the two new specialists, I am usually so far in the game that they do not really matter at all... usually I go Commie if I have serious corruption problems.