First Screen lockup on New Mac Pro.

[geon]

Well, I was reloading a web page and I got the spinning beach ball and I couldn't force quit or do anything. Computer went to sleep for a about a minute, but woke up when I moved my bluetooth keyboard....blue screen with motionless ball in the middle. Finally, figured out I had to hold the power button down for 5 seconds to shutdown.
I went a week without a hiccup, so last night I added my 4 gb of ram, ran great up until this event this evening.

Here's the report. Can anyone decipher it for me? Not sure it will tell me anything.
2x2.8 Mac Pro.

Thu Feb 14 19:59:35 2008
panic(cpu 2 caller 0x001246E5): "ipc_right_clean: strange type"@/SourceCache/xnu/xnu-1228.3.13/osfmk/ipc/ipc_right.c:628
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x811b7e28 : 0x12b0e1 (0x457024 0x811b7e5c 0x13321a 0x0)
0x811b7e78 : 0x1246e5 (0x456d6c 0xe09 0xaffc8e0 0x9fe1ba8)
0x811b7eb8 : 0x13b5dc (0x98631f8 0x202 0x811b7f08 0x36e09b)
0x811b7f08 : 0x370271 (0x9fe1ba8 0x0 0x1 0x0)
0x811b7f58 : 0x37029f (0xa1e7560 0x0 0x9f83864 0x377343)
0x811b7f78 : 0x3dbe77 (0xa1e7560 0x9f83820 0x9f83864 0x0)
0x811b7fc8 : 0x19f084 (0x9f7f200 0x0 0x1a20b5 0xa11be40)
No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xbffffcd8

BSD process name corresponding to current thread: mDNSResponderHel

Mac OS version:
9C31