Just wondering: how could by development stuff almost have bricked a tablet? If it was an issue that got fixed by a nandroid, it was just a ROM that refused to boot. That's definitely not a brick. Aside from that, the only thing that could seem like a brick with the stuff I had was a bug in the update script that killed the cache partition, and was only fixable by sending a 'fastboot erase cache'.
No other freaky stuff going on there..
And I assume you had the right base addresses and right HBOOTs for the stuff you were trying?
Devices I have: HTC Desire, HTC Flyer
Member of XK Team, delivering CM and MIUI goodness to the HTC Flyer
Donations by Paypal: firstname.lastname@example.org