.org is fantastic because VeriSign doesn't control it. Though the organization that controls .org isn't the most benevolent either, but it's a lot better, it seems.
At first, I am in disbelief about k.org and b.org - I figured KORG would have acquired the former and some Star Trek fan (or Paramount themselves) would have acquired the latter. But then I realized that the holders of these domains were probably asking too much and while there's no infringing content being hosted, the owners of these marks don't care.<p>If you're planning on acquiring one of these and hosting anything related to someone else's "IP," be ready for legal harassment.
I was curious about single-character non-.org domains and found this to be an interesting read: <a href="http://en.wikipedia.org/wiki/Single-letter_second-level_domain" rel="nofollow">http://en.wikipedia.org/wiki/Single-letter_second-level_doma...</a><p>Essentially, before Project94, all single-letter domains in .com/.org/.net were reserved except for those that existed in 1993 (i.net, q.com, q.net, x.com, x.org, z.com). Nissan (famous for not owning nissan.com) owns z.com and has a Z series of cars but doesn't use it.
Registered for the s.org with <a href="http://www.sciencegist.com" rel="nofollow">http://www.sciencegist.com</a>, free and open source project that aims to bring scientific papers closer to everyone. Offered a fair chunk of money too, but I'm sure it's not going to be enough. Quite silly, these domain name wars :)
I can't tell from the page how much these cost. The linked page seems to suggest that they might be free for the right organization, but if you go to one of the domain pages, there's an "Offer Amount" text box.