Any updates Smartazz? I've noticed that I get this too with post 12.2 drivers including betas. Interestingly, I also have a HP2509m as my display. Could be related. I also think it has something to do with graphics card overclocking and the newer drivers. I noticed you have yours pretty overclocked. Since unofficial (past CCC limits) overclocking was recently dropped, I have to inject a couple older dll files into windows (or MSI Afterburner) to overclock properly and especially with Crossfired 5850s. Could be related to this for me... all I notice is that the flicker or display tearing, only seems to happen if I overclock past CCC limits. I also only see the flicker in a 2D environment and not in 3D games. Weird.
Another side question, do you have problems with HDMI and scaling on your 2509m with an AMD graphics card? I'm using DVI now, but for some reason I found the picture a lot more pleasing with HDMI and want to switch back. Currently when I try HDMI, it forgerts the 0 overscan setting every boot and zooms my desktop in to far. :S