Thanks for the insight, but please excuse this (perhaps ignorant) follow-up... I did indeed change my IMEI/PIN to the new BB on my existing Cingular account. Thus, as I interpret your comments, I can fairly bill the 7290 on eBay as "Cingular-ready" if sold locked? Moreover, because I changed the IMEI/PIN, a buyer should have minimal difficulty activating the 7290 on whatever carrier they prefer?
Trust me: I'm not trying to "obligate" you to something; I just take my eBay sales seriously and don't want to surprise buyers. If I need to sell it essentially saying "You'll have to figure out how to activate the cellular aspect yourself," so be it. I like to be upfront with buyers about what they're getting, however, and if reactivating the 7290's cellular aspect isn't a big deal, I'd (obviously) like to communicate that...
By the way, I visited your site and read your review of the 8700. VERY well done. I never noticed the frowny/smiley thing between keyboards before, but that cracks me up