If you're rooted, try the linked file. Install it, press fix, reboot. There's a good chance it will show in the market again.
Gb has been no better than froyo so far for me. Been laggy, lots of force closes, going back to froyo might be in order for me. My phone just ran smoother.
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Found the apk online, working fine now. It's a shame an update can suddenly make your device incompatible with apps that were working just fine previously. Still trying to get my Touchdown Pro license key back somehow.