Powerbook won't wake up from sleep, trouble rebooting, kernal panic

Hi,
My powerbook has recently been having some troubles. This started over the weekend and nothing major has changed recently. I added some new RAM months ago, but that was like in June maybe, and it was Samsung module which i think is what that line of powerbooks used originally. The computer had been exhibiting signs of sluggishness and slow operation which i was mostly attributing to a pretty full HD that was in need of some optimazation and maintenance (which i do semi-regularly with Tech Tool Pro).
So, when it goes to sleep, or when the lid gets closed, it won't wake back up. black screen and unresponsive to any keys, though i can still hear the fans and some HD spinning noises inside. So, this forces me to force shutdown by holding the power key until i hear the machine turn off. Then reboot. When re-booting i have been getting a combination of kernal panics and freezes on startup, just hanging with a blue screen and a spinning startup indicator.
I can boot with no problem from an external Firewire drive. So i've run a ful Tech Tool sweep of the machine, optimized the HD and all that. Then, all is well UNTIL it goes to sleep again and then i'm back in the same cycle.
Any thoughts or advice here?

Yeah. I guess i am going to take it in this week. in the meantime though, i wonder if anyone can translate this panic.log entry from another round of kernal panics that i just went through this morning. I had about 4 or 5 of them in a row after trying to reset my PRAM to try and fix an issue with my external isight.
Sun Nov 2 10:36:21 2008
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000000000000 PC=0x00000000002D1248
Latest crash info for cpu 0:
Exception state (sv=0x38221A00)
PC=0x002D1248; MSR=0x00009030; DAR=0x00000000; DSISR=0x40000000; LR=0x002D2250; R1=0x21F7BC60; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002D2244 0x008F2E30 0x008F1FBC 0x008F4AA0 0x008F4A24 0x0003CA1C
0x000A9714
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleUSBHub(2.5.6)@0x8ef000
dependency: com.apple.iokit.IOUSBFamily(2.8.1)@0x463000
Proceeding back via exception chain:
Exception state (sv=0x38221A00)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x37B4E280)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x000954F8 0x00095A10 0x00026898 0x000A8204 0x000ABB80
Proceeding back via exception chain:
Exception state (sv=0x38221A00)
PC=0x002D1248; MSR=0x00009030; DAR=0x00000000; DSISR=0x40000000; LR=0x002D2250; R1=0x21F7BC60; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x002D2244 0x008F2E30 0x008F1FBC 0x008F4AA0 0x008F4A24 0x0003CA1C
0x000A9714
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleUSBHub(2.5.6)@0x8ef000
dependency: com.apple.iokit.IOUSBFamily(2.8.1)@0x463000
Exception state (sv=0x37B4E280)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC

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