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It actually released a little before 10.5.3 hit. I put some initial impressions on my blog (linked in my sig) if anyone's interested.
 
I downloaded it at around 7:15AM central standard time so it has pretty much been out all day.
 
It's copied over all everything from my previous version.

How do I get it to sync to my iPod? Nothing is in the Notes section
 
I hope they release a touch/phone App so that I can have my library on the touch/phone, and use it as a scanner.
 
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