Made a few changes to my Google-altering Greasemonkey script (added fixed-size thumbnails, access keys, fix for people who are logged in to a Google account) and I'm quite pleased with the way it's turned out. Install the script here.
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Does this script have any elements that would prevent it working in Opera? For some reason the thumbnails don't show up.
Yes, the XPath selectors aren't supported in Opera (see http://people.opera.com/rijk/opera/userjs.html ), so the script won't work there.