Apple has a kbase doc today titled iTunes 7.6: If you are asked to accept incoming network connections that suggests reinstalling using the iTunes 7.6 download updater. I had updated (on Jan. 15th release date) using the download version (not Software Update) and still saw that message each time - despite having iTunes in Apps Firewall set to allow incoming connections (since day 1 of leopard install). Removing iTunes from the Firewall apps list worked once (and still synced w/AppleTV) but it's added again to the list (still set to allow incoming connections) and the message reappears next time it's used. I just downloaded it again and reapplied it in case they revised something. That seems to have worked - and the download is dated Jan 16th vs Jan 15th date on original download itunes.dmg file. (Minor difference (.1MB) in file size also.) Just a FYI in case you had seen the (repeated) prompt also.

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