Kernel panics, IMHO, are bound to happen sooner or later. Later could happen in two years or 2 days. Albeit, bad hardware, software or errant tachyons flying through your CPU can cause them. If the KPs are persistent, which yours doesn't seem to be, I would just collect the log information and try to figure out a rhyme or reason. I have had about 4 KPs since OS X 10.0 on the 4 computers I use. Two of them have been on my brand new stock dual 867. Do a search of this forum and you will see a lot of things causing KPs.
If your installation ran for a month without a KP logging onto an SMB share, it might be something else now.