We know SL is buggy. You shouldn't upgrade before June 2010 or so.
I have a new i5 though, so I have to live with the bugs.
Today my screen saver locked up in an odd way. It cycled between two images, and I couldn't get it to stop. I switched to my Admin account and rebooted from there.
I'm streaming images from a server, and I'm seeing the old 10.5 network flaws, so I wonder if this is a combination of network bugs and screen saver bugs.
If it recurs I'll move my images locally and eliminate the 802.11n traffic.
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