Hiding a CLI-only user account in Mac OS X 10.5 Leopard

A year and a half ago I installed the excellent PostgreSQL via MacPorts, and had to create a user account manually. Annoyingly, this postgres user shows up in the GUI login screen and Fast User Switching menu under Leopard. I found a fix today.
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MacBook Pro crashes part 3 – apparently a hardware issue

In frustration I made a backup of my laptop hard disk, and did an erase-and-install with Tiger from the install DVDs that came with the laptop. Mind you, the Apple Hardware diagnostic gives this machine a clean bill of health. With the original 512MB DIMM, with nothing plugged in but the power cord, and with a fresh Tiger install, even following an SMC reset, I can crash it. So, this is apparently not Leopard’s fault.
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Leopard GUI Crashes – Not Parallels but Canon?

I had some serious Leopard stability problems recently. I thought I had found the problem but I was wrong then.

This time I’m pretty sure I’ve gotten rid of all the badness. I’ve had almost 2 days of continuous uptime, which may not sound like something to get excited about, but it sure beats the 4-6 hour average uptime I’ve had for the past few weeks.

I’ve spent so much time on this that I’m not willing to put in the extra 4-8 hours it would take to really truly isolate this issue. But my best guess is that it was the Canon drivers for my recently purchased Canon PIXMA MX310 multifunction printer. Specifically I think it’s the scanner driver, but I’m not certain. If so, that would mean that the culprits were BJUSBLoad.kext and BJUSBMP.kext in /System/Library/Extensions.
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