Ask HN: Are single-letter domain names valuable?

a few (mostly obscure extensions) can be purchased in the aftermarket - for example L.fo is currently being auctioned http://www.sedo.com/auction/auction_detail.php?language=e... - also see http://www.namepros.com/domains-for-sale-fixed-price/616074-...

wiki = friend

http://en.wikipedia.org/wiki/Single-letter_second-level_doma...

They're reserved by ICANN