Unibody MBP - black squares glitches in OSX but not in bootcamp.

Hi
I have a strange graphics problem with my unibody and just wonder if its worth sending in for a repair or if it might be a known software issue:
Usually when web browsing, the mouse pointer will suddenly become unresponsive for a moment.
It will then just react strangely to my mouse movements - like it is over sensitive.
After this i will then see visual artifacts on the screen.
These appear as black square shapes around various windows.
I then regain full control over my mac but the black squares remain.
If i move an open window over one of the black artifacts it clears.
Occasionally it never recovers and i have to do a hard restart of the machine.
I also found that while attempting to play 'runescape' - a java based 3D game running in a web browser (firefox in this instance) that i would get a severe version of the issue stated above ending with my screen flickering - again forcing a hard restart.
Here is my conundrum though - this ONLY happens in OSX
I run windows7 64bit under bootcamp for gaming and can game for hours at a time with not one single crash or glitch which leads me to question wether this is a hardware issue at all.
I have done a FULL clean install of snow leopard which included trashing my user folder and creating one from fresh. (i only retained my documents).
Any advice / familiar stories would be greatly appreciated.
Thanks so much.

At home I've used both a NetGear and Belkin router (both N band), at work we have various networks using Cisco kit.
The encryption types vary depending on which network I'm connecting to.
The WiFi drops on all of them when in OSX but runs flawlessly on all of them when in Windows 7.
I'm currently sat here at home in the living room connected to a Netgear WNR2000 which is in the room directly above me.
Signal strength is full and the encryption is WPA-PSK + WPA2-PSK.
It had been connected for around an hour without disconnecting but then in the last 20 minutes it's disconnected twice; both times refusing to reconnect automatically forcing me to turn the airport off and then back on.
The fact that the same hardware works fine in windows 7 would suggest that this has to be a software issue inside OSX.

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pmset -g
Active Profiles:
Battery Power                    -1
AC Power                    -1*
Currently in use:
standbydelay         4200
standby              0
womp                 1
halfdim              1
hibernatefile        /var/vm/sleepimage
sms                  1
networkoversleep     0
disksleep            10
sleep                0 (sleep prevented by InternetSharing, coreaudiod, coreaudiod)
autopoweroffdelay    14400
hibernatemode        1
autopoweroff         1
ttyskeepawake        1
displaysleep         60
acwake               0
lidwake              1
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Assertion status system-wide:
   BackgroundTask                 0
   PreventDiskIdle                0
   ApplePushServiceTask           0
   UserIsActive                   1
   PreventUserIdleDisplaySleep    0
   InteractivePushServiceTask     0
   PreventSystemSleep             1
   ExternalMedia                  0
   PreventUserIdleSystemSleep     1
   NetworkClientActive            0
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Unibody MBP - black squares glitches in OSX but not in bootcamp.

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