Version 1.5 has been released, but isn't listed here. Sadly, it worked for about a week and broke again...

Nice improvements in v1.3 - however, you'll need to update the listing here if people are going to be aware of it! ;-)

+ Smart Update is excellent
+ Toolbar looks much more polished

Still a couple little nits:
- Contrary to the notes for v1.2, it saves the window size but not position.
- Toolbar looks better, but please give us the standard customization sheet.
- Now that we have a "Browse" button for the WoW folder, why not drop the path entirely? Take a look at how browsers handle Download folder locations.
- Select All is a good start for the menu bar, but please flesh it out with the other various commands in the interface. Some people won't want to use the toolbar, and key commands on menu items are always helpful. :)
- Preferences window probably doesn't need an OK button; generally preferences are applied on closing the window.

An excellent start. Several things need some updating, however:
1) The user should be able to use a standard Open dialog to locate their WoW installation. Typing out paths doesn't cut it.
2) We need "Select All"; preferably the standard Edit menu.
3) Toolbar should be customizable.
4) Doesn't remember window position or size.
5) When updating addons, use a progress bar - you know how many addons are being installed, so there's no reason for an indeterminate progress indicator.

Nice GUI and its fast. Haven seen any crashes yet. Time to get rid of MacAceUpdater. =D