After some testing with a friend, I've found out that there is now a cap of five seconds on the length of alert sounds in Leopard. I had a six second sound clip I was using as a notification to get my attention when a particular member of my buddy list logged on -- so I would notice if I was away from the computer. After upgrading to 10.5, it stopped playing.If you have any longer alerts you use (such as for an alarm in iCal), you'll need to use an audio editor of some sort to cut it down to five seconds or less. This may not be that widespread an issue, but I do know at least three other Mac users that use slightly longer alerts for varying reasons.[robg adds: This was confirmed by one of our queue reviewers.]

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