Two-letter domain Mr.com sold at auction this week for $24,712 USD. This name is generic yet relevant enough to be used for a wide variety of the websites. Personally, I think the buyer got a great deal. This name should have sold for a lot more, especially considering it is only two letters long.
Also of note is the sale of 363.com for $41,000, ccTLD docs.com.cn for $31,000 and boxing.net for $15,000. Indian domain budgetair.in also fetched $20,000. Another winner is kopfhörer.de (German for “headphones”), which garnered $8,185.