10.5.6 Problems with my Macbook pro

Since I updated my MacBook Pro (Mid 2007) with the latest update 10.5.6 I've been having panic attacks. I first thought that it had something to do with what was plugged into the USB ports (Logitech USB mouse with LCC and Pinnacle HD Stick 800e). I removed both the software and the hardware for both devices. I still have the panics and I don't know what to do. Can I roll back the update to 10.5.5? Here is the panic report below, can someone tell me what it means?
Tue Dec 23 15:22:56 2008
panic(cpu 1 caller 0x001A9C68): Kernel trap at 0x203ae0ba, type 14=page fault, registers:
CR0: 0x80010033, CR2: 0x203ae0ba, CR3: 0x01474000, CR4: 0x00000660
EAX: 0x00000000, EBX: 0x08c8e980, ECX: 0x00000000, EDX: 0x020f8bf8
CR2: 0x203ae0ba, EBP: 0x68e43f78, ESI: 0x00000000, EDI: 0x07493d80
EFL: 0x00010293, EIP: 0x203ae0ba, CS: 0x00000008, DS: 0x00000010
Error code: 0x00000010
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x68e43d08 : 0x12b4f3 (0x45b13c 0x68e43d3c 0x1335e4 0x0)
0x68e43d58 : 0x1a9c68 (0x464700 0x203ae0ba 0xe 0x463eb0)
0x68e43e38 : 0x1a038d (0x68e43e50 0x0 0x68e43f78 0x203ae0ba)
0x68e43e48 : 0x203ae0ba (0xe 0x48 0x10 0x10)
0x68e43f78 : 0x3df460 (0x6e58e90 0x7493d80 0x7493dc4 0x0)
0x68e43fc8 : 0x1a0887 (0x71a5be0 0x1 0x1a30b5 0x88fdc80)
No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xbffff888
BSD process name corresponding to current thread: nmblookup
Mac OS version:
9G55
Kernel version:
Darwin Kernel Version 9.6.0: Mon Nov 24 17:37:00 PST 2008; root:xnu-1228.9.59~1/RELEASE_I386
System model name: MacBookPro3,1 (Mac-F4238BC8)

Thanks Kappy.
I noticed that my panic attacks are random. Whatever process or app running at the time show up in the thread. I tried Rember to test my memory 2 crucial 2gb chips and it crashed with another panic. I pulled one of the chips out and ran the test again and it made it through. I tested the other chip and the OS rebooted itself. I ran the test again and it it completed and tested ok. When I tested both chips at the same time it panic. Before I go send the money for new memory can memory cause these panics?

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