
What a shame!
Front Row 2 doesn’t work with Air Tunes! It was so fine with Front Row 1.3… and Leopart (Mac OS 10.5) includes Front Row 2 only.
I found how to downgrade here and in french here.
Here is the solution, just in case:
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As you may know FrontRow 2.0 misses on important FrontRow 1.x features. Opening it without stopping the music. That is why we downgrade Frontrow to 1.x 
First get the Front Row 1.3 Update: http://www.apple.com/support/downloads/frontrow131.html and mount the Image.
Open a Terminal (Applications -> Utilities -> Terminal.app)
Backup your Front Row 2.0
sudo mv /System/Library/CoreServices/Front\ Row.app /System/Library/CoreServices/Front\ Row.app2.0
Once the image mounted you can right click on the package and chose “show package contentsâ€
Then, in “Content” double click on “Archive.pax.gz”. A folder named “Archive” will be added to you download folder.
Then go in Archive > System > Library > Coreservice
Copy (command C) FrontRow. Then go to you local Hard Drive and past it in system > library > coreservice
(I didn’t need a restart for Front Row to work again)
If you want to come back to Front Row 2.0 :
- sudo mv /System/Library/CoreServices/Front\ Row.app /System/Library/CoreServices/Front\ Row.app1.0
- sudo mv /System/Library/CoreServices/Front\ Row.app2.0 /System/Library/CoreServices/Front\ Row.app
And back to Front Row 1 again :
- sudo mv /System/Library/CoreServices/Front\ Row.app /System/Library/CoreServices/Front\ Row.app2.0
- sudo mv /System/Library/CoreServices/Front\ Row.app1.0 /System/Library/CoreServices/Front\ Row.app