Are you talking about just making those single 88x88 thumbs for thumb preview TGPs, or square thumbs for whole galleries?
For 88x88 thumbs for preview TGPs, I've settled on starting up photoshop 5.5 (loads faster, thats why an old version, unless I already have a newer version open.), shft-alt selection to square select the models face, then an action to resize and save for web.
There are other tools that do okay to make square thumbs for whole galleries, altho all of them have their limitations.
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