OK Guys, I've tried the :
fix-i8xx-gtt-cache-coherency-v7.patch
locking_for_chipset_flush.patch
&
gtt_space_null_means_no_pages_ref.patch
patches against 2.6.34-rc3 for about a week now.

I have :
Intel Corporation 82852/855GM Integrated Graphics Device (rev 02) (prog-if 00 [VGA controller])

libdrm 2.4.18
xorg-x11-drv-intel-2.9.1
xorg-x11-server-Xorg-1.7.6

The patch seems quite stable, although I just experienced a (Non fatal) Crash.
So nice job guys, it's much better.

The crash I just got looks like :

Apr 19 20:28:48 m3n kernel: [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Apr 19 20:28:48 m3n kernel: render error detected, EIR: 0x00000000
Apr 19 20:28:51 m3n kdm[1368]: X server for display :0 terminated unexpectedly

It is the first time it has crashed using the patches, the screen just went black, input was totally lost, I was able to safely shut down the machine by pressing the power button once and I am seeing lots of stuff like :

Apr 19 16:35:59 m3n kernel: chipset flush no. 2752512, max retries 7
Apr 19 16:42:43 m3n kernel: chipset flush no. 2768896, max retries 7
Apr 19 16:45:03 m3n kernel: chipset flush no. 2785280, max retries 7
Apr 19 16:45:58 m3n kernel: chipset flush no. 2801664, max retries 7
Apr 19 16:47:54 m3n kernel: chipset flush no. 2818048, max retries 7
Apr 19 16:49:08 m3n kernel: chipset flush no. 2834432, max retries 7
Apr 19 16:50:26 m3n kernel: chipset flush no. 2850816, max retries 7
Apr 19 16:52:57 m3n kernel: chipset flush no. 2867200, max retries 7
Apr 19 16:56:29 m3n kernel: chipset flush no. 2883584, max retries 7
Apr 19 16:57:46 m3n kernel: chipset flush no. 2899968, max retries 7
Apr 19 16:58:27 m3n kernel: chipset flush no. 2916352, max retries 7
Apr 19 17:02:14 m3n kernel: chipset flush no. 2932736, max retries 7
Apr 19 17:05:27 m3n kernel: chipset flush no. 2949120, max retries 7
Apr 19 17:10:07 m3n kernel: chipset flush no. 2965504, max retries 7
Apr 19 17:12:00 m3n kernel: chipset flush no. 2981888, max retries 7
Apr 19 17:15:20 m3n kernel: chipset flush no. 2998272, max retries 7
Apr 19 17:17:07 m3n kernel: chipset flush no. 3014656, max retries 7
Apr 19 17:17:54 m3n kernel: chipset flush no. 3031040, max retries 7
Apr 19 17:18:57 m3n kernel: chipset flush no. 3047424, max retries 7
Apr 19 17:26:08 m3n kernel: chipset flush no. 3063808, max retries 7
Apr 19 17:26:37 m3n kernel: chipset flush no. 3080192, max retries 7
Apr 19 17:28:20 m3n kernel: chipset flush no. 3096576, max retries 7
Apr 19 17:28:55 m3n kernel: chipset flush no. 3112960, max retries 7
Apr 19 17:29:58 m3n kernel: chipset flush no. 3129344, max retries 7
Apr 19 17:30:20 m3n kernel: chipset flush no. 3145728, max retries 7
Apr 19 17:30:44 m3n kernel: chipset flush no. 3162112, max retries 7
Apr 19 17:31:26 m3n kernel: chipset flush no. 3178496, max retries 7
Apr 19 17:31:54 m3n kernel: chipset flush no. 3194880, max retries 7
Apr 19 17:35:13 m3n kernel: chipset flush no. 3211264, max retries 7
Apr 19 17:35:34 m3n kernel: chipset flush no. 3227648, max retries 7
Apr 19 17:37:11 m3n kernel: chipset flush no. 3244032, max retries 7
Apr 19 17:38:20 m3n kernel: chipset flush no. 3260416, max retries 7
Apr 19 17:38:48 m3n kernel: chipset flush no. 3276800, max retries 7
Apr 19 17:40:20 m3n kernel: chipset flush no. 3293184, max retries 7

In the message log.
Flash video video in full screen shows a noticeable degradation in performance compared to the user mode driver also.

So, I've not had the kernel lock up, just the xserver die. The patches are an improvement to 2.6.34-rc3 but it's still a regression in comparison to the user mode i915 driver found in previous versions.
When they push xserver 1.8 and the newer xorg-intel driver into Fedora's rawhide, I'll grab it and test it out.

Thanks guys