I use Textmate myself too. Very happy with it. It's aimed at RoR developers but works as well as any other editor for PHP, etc.
Be sure to add a shortcut to your htdocs folder within Finder. I have a shortcut just above my documents folder. Saves a lot of clicking to get into apps/xamp/htdocs
If you are looking for a
FTP app, look no further than Transmit. Live edits on the server, automated updates,
ftp connections in tabs, dashboard widget, ah, it's just nice.