Predictable pattern of kernel panics - can you interpret a panic report?

Question

Hi. Long time listener, first time caller.
I installed 10.5 on my PB as soon as it became available and have had an issue with kernel panics ever since. The panics arrive in waves of ~12-15 at a time over the two to three days (~36-48 hours of uptime) immediately subsequent to my having booted from a volume other than the 10.5.2 system on my PB's internal HD. When the panics have run their course, everything returns to normal, and no problems of any kind arise until after I've temporarily booted into another volume.
I have experienced these waves of kps after booting from a 10.5.2 volume on an external drive; two different 10.4.11 volumes on two different external drives; the 10.5 retail install disc; a brand new DiskWarrior 4.1 CD, and the AHT volume on the (replacement) Install and Restore disc that came with my computer. (None of the utilities I've used to attempt diagnose my issue have returned any errors or warnings about the state of my hardware \[incl. RAM and AEBS] or my main boot volume.)
I've attached the latest panic report below. It is identical to all of my PanicReporter entries for the past 6 months. I can see that this may be AirPort (driver) related, but if you can offer a more incisive reading of the report than that, I'm definitely interested in what you have to say.
Thu May 22 12:32:18 2008
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x000000000000000C PC=0x00000000002A9684
Latest crash info for cpu 0:
Exception state (sv=0x249d8c80)
PC=0x002A9684; MSR=0x00009030; DAR=0x0000000C; DSISR=0x40000000; LR=0x3014576C; R1=0x1E573C00; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x301456A0 0x30155BB0 0x300F5EC4 0x00356AC8 0x00355D2C 0x00355DE0
0x000B05D4
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AirPortBrcm43xx(312.46.51)@0x300ec000->0x30218fff
dependency: com.apple.iokit.IO80211Family(211.1)@0x2498b000
dependency: com.apple.iokit.IOPCIFamily(2.4.1)@0x1e5f8000
dependency: com.apple.iokit.IONetworkingFamily(1.6.0)@0x24482000
Proceeding back via exception chain:
Exception state (sv=0x249d8c80)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x2469a780)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9C7010
Kernel version:
Darwin Kernel Version 9.2.2: Tue Mar 4 21:23:43 PST 2008; root:xnu-1228.4.31~1/RELEASE_PPC
System model name: PowerBook5,1
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x0009B478 0x0009BE1C 0x00029DD4 0x000AF210 0x000B2A78
Proceeding back via exception chain:
Exception state (sv=0x249d8c80)
PC=0x002A9684; MSR=0x00009030; DAR=0x0000000C; DSISR=0x40000000; LR=0x3014576C; R1=0x1E573C00; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x301456A0 0x30155BB0 0x300F5EC4 0x00356AC8 0x00355D2C 0x00355DE0
0x000B05D4
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AirPortBrcm43xx(312.46.51)@0x300ec000->0x30218fff
dependency: com.apple.iokit.IO80211Family(211.1)@0x2498b000
dependency: com.apple.iokit.IOPCIFamily(2.4.1)@0x1e5f8000
dependency: com.apple.iokit.IONetworkingFamily(1.6.0)@0x24482000
Exception state (sv=0x2469a780)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current threa`
Thank you.

Answer 1

Because this post contains information that may be useful to others later on, I will not ask that it be removed as I have some of your previous posts in this topic.
Notes:
Panics do indeed occur in various situations, but as you suggest, I cannot at every moment account for the status of background processes. As I've said, however, the data in the panic reports I have amassed over the past six months are (virtually) identical. And as I pointed out more than once, these spates of panics occur in predictable, repeatable cycles.
AHT in Extended, loop mode over 24 hours has not detected a RAM issue, though I am aware that this does not necessarily rule a RAM issue out.
As mentioned above, neither DU's Disk Repair nor DiskWarrior have solved this issue.
No data was transferred to this present installation via TDM or Migration Assistant. It was an E&I onto a freshly formatted volume. There is very little third-party software installed (BBEdit; CSSEdit; an FTP client and various browsers). Other major third-party software exists on 10.4.11 volumes because I am too cheap to upgrade many of these products when older versions still work well in the previous OS.
There is no third-party hardware attached to this machine beyond a variety of HDs (all OWC; Hitachi), and there is no firmware to update for any other peripherals being used, however sporadically.
This problem has presented itself through a variety of installation options, including a simple upgrade from 10.4.10; an A&I over a 10.4.10 volume; E&Is both using and not using Migration Assistant (with A&Is following both), and cloning an E&I on an external volume back to a newly formatted volume on my PB.
Could be the RAM, but the symptoms (and the log files) tell me that more likely it's an I/O issue having something to do with AirPort, which brings you and I full circle, I guess.
Thanks again!