Currently available version of Google Talk Video plug-in for Mac OS X (1.0.13.1284) might cause up to a 30-second delay while putting the computer to sleep under Snow Leopard.
This has been reported and discussed in the following Apple support thread. In the end, the solution typically requires to uninstall Google Talk Video. The solution was found and reported by Snoop Dogg in that same thread.
Basically, the misbehaving process can be found by running sudo pmset -g log then looking for the process with the highest response time. In my case:
$ sudo pmset -g log ... * Domain: applicationresponse.timedout - Message: Kernel GoogleTalkPlugin com.apple.powermanagement.applicationrespons e.timedout 30000 ms - Time: 9/2/09 12:42:47 AM GMT+02:00 - Signature: GoogleTalkPlugin - UUID: AD1E9199-B66D-41CB-BF4F-590EF232DE79 - Result: Noop - Response time (ms): 30000 ...
felipe-alfaro.com 
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Ice, great response and thank you once again for being such a sharp writer and friendly supporter of my work. God bless you and I hope you’re gearing up for a pleasant summer! I know I am looking forward to some camping and the backyard bbqs. I even have a Baptist retreat scheduled which I am very excited about. How about you?