Booted into Mint-9, launched Synaptic and ran all updates and after a reboot all seems well. No more hangs or pauses. Got Compiz Fusion running with lots of effect. Videos play great, etc. So it appears my ATI Radeon X1950 Pro AGP is now working as it should. Not sure what the specific fix was (I'm guessing a kernel update) but I'm glad it's working.
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tim@Linux-Mint9 ~/Desktop $ inxi -Gx
Graphics: Card ATI RV570 [Radeon X1950 Pro] X.Org 1.7.6 Res: 1920x1080@60.0hz
GLX Renderer Mesa DRI R300 (RV560 7280) 20090101 AGP 4x x86/MMX/SSE2 TCL GLX Version 1.5 Mesa 7.7.1 Direct Rendering Yes