How about a Wiki that lists cell-phone numbers (for all who want to be included)? Our colleague Peter Elstrom (below) offers the idea. To avoid telemarketers or spammers, he proposes that members register for the service. The Wiki, he says, would feature a search box, and the system would record which member asked for each number. Only one search at a time.
I don't think I'd be a charter member of this group. Let the Elstroms of the world iron out the kinks, and maybe I'll follow. You? (I just did a Technorati search on this subject. I guess I shouldn't be surprised that there appear to be gobs of spam blogs on cell-phone service.)