If you still get issues it could be because of your SSE2 processor, I switched to a SSE3 X2 and my crashes stopped.

Apparently Leopard is much more SSE3 dependent than its predecessors.

The thread i posted is here: http://www.infinitemac.com/comments.php?DiscussionID=654&page=1#Item_9

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 Mac OS X 10.6.4 Retail || Intel Core2 Duo E8200 2.66GHz || Gigabyte G31M-ES2L || GeForce 6600 GT 128MB || Realtek ALC883 Audio || Realtek RTL8169 LAN || Samsung SpinPoint F1 1TB HD || Sony Dual Layer IDE DVD RW DW-D22A || Apple Aluminium Keyboard || Mighty Mouse

 MacBook Pro || 2.4Ghz Core 2 Duo || 200Gb HD || 2Gb Ram || NVIDIA GeForce 8600M GT

 iPhone 4 || 16Gb