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hardware diagnosis in darwin

I've got a perplexing problem which seems to be a hardware, most likely RAM related, problem[1]. I've got three questions:

1. Are there any particularly good forums for this sort of topic (it is obviously a bit tangential to the focus of this list.)

2. Are there any particular tools and/or methods for diagnosing (Apple) hardware problems in Darwin, such as memory testing, diagnostics information from the kernel, etc.?

3. In a CrashReporter log, is there anything particular to note about "Unknown memory fragment", i.e.:

Exception: EXC_BAD_ACCESS (0x0001)
Codes: KERN_INVALID_ADDRESS (0x0001) at 0xd0c8c9d7

Thread 0 Crashed:
0 <Unknown memory fragment> 0x08f970ac 0x8f93000 + 0x40ac
1 <Unknown memory fragment> 0x08f976dc 0x8f93000 + 0x46dc
[...]

and in the Binary Images Description:
[...]
0x8dfc000 - 0x8dfd806 AdobeUnitTypes PEF binary: AdobeUnitTypes
0x8f93000 - 0x8fc5f67 <Unknown memory fragment> PEF binary: <Unknown memory fragment>
0x9ea8000 - 0xa145512 ARMLib PEF binary: ARMLib
[...]

The location of this "Unknown memory fragment" varies some across reboots.

-john

[1] Specifically, an OSX Application (Photoshop CS) reliably crashes and other applications have had suspicious but un-reproducable problems if I have more than one DIMM installed. I have two 512MB DIMMs and one 256MB DIMM, all of which I've been using in my G4/533 for a couple yeras without incident prior to the last couple days. It doesn't seem to matter which DIMM I install or which slot I install it in suggesting that the DIMMs and slots are okay. The Hardware Test CD that came with my computer doesn't seem to find any problems. I think I've exhaustively eliminated software problems as a cause, even to the point of a fresh clean OS (Panther) and Photoshop install on a couple machines. The problem is clearly on just one machine and related somehow to the memory configuration.
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