Whine Cellar 3: OSX Update Keeps on Crashing

Ever since I installed the latest Leopard update, my laptop kept on crashing and crashing and crashing, until it takes the sanity out of me. How can Mac OS X be this unstable?
First off, I have a legal copy of OSX (from Developer Connection), installed it in Bella, the MBP, and everything went smoothly. It even imported my old account with no difficulty whatsoever. Everything was fine, and all the UI flair smoothly rendered on my screen.
But now, after I updated to 10.5.1, I had “n” crashes (I can’t count them anymore) wasting precious coding and debugging time. What’s more is my laptop just dies, with no warning whatsoever, in the middle of me using it. Of course I’m expecting Apple to fix these stuff, and they should, because that’s what they did on Tiger when I first had this laptop last year. Wifi software was f***ed up, to the point that I needed to connect using a LAN cable just to prevent the new system from crashing. But this one is worse! I mean the laptop literally shuts down without any transition or even a few seconds of delay.
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