Lenovo has several releases, according to the readme:
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Version Build ID Rev. Issue Date ----------------------------------- -------- ---- --------------- 8.593.100.7-090929a-090748C-Lenovo 79D179WW 01 2009/11/10 8.533.3.1-081110a-075168C-Lenovo 79D177WW 01 2009/01/30 8.442.3-080103a1-057754C-Lenovo 79D172WW 9th release 8.441-071128a-056348C-Lenovo 79D171WW 8th release 8.322.214.171.124-070621a2-050878C-Lenovo 79D165WW 7th release 8.362-070405a-046310C-Lenovo 79D164WW 6th release 8.293.1-060913a-036475C-Lenovo 79D162WW 5th release 8.241.1-060324a-031947C-Lenovo 79D141WW 4th release 8.231-060221a1-031193C-Lenovo 79D135WW 3rd release 8.204-051220a1-031127C-Lenovo 79D122WW 2nd release 8.204-051220a1-029804C-Lenovo 79D121WW Initial release
Lenovo has not released any versions between 8.442 and 8.533, it seems, and the Omega Drivers only go up to 8.442 myself, so I was stuck. Fortunately, a lucky solution was found. It seems that an intermediate version - 8.512 for Mobility X1400 on Windows XP is available through Microsoft's update catalog. By default it won't install on the T60, because the INF has some hardcoded subsystem IDs (and therefore Windows Update will not offer it to you as well). However, if you force the installation ("I will choose which driver to install"), then it works great, shows version 8.512.0.0, no pixelization issues in Angry Birds, and GPU scaling is available in the Catalyst Control Center.
Decided to post this here, in case someone else ever looks for an intermediate version of the ATI driver for their T60 to resolve some strange issue. Note that a separate version is available for Mobility X1300/X1550 series.