Premium 1 letter domain names

[Alex]

Hello,

I was wondering what one letter domain names would you register if a cctld would let you register them. What are the most valuable letters to be registered.
And also, what are the best combination of two letter words (PC, TV, IM?).
And why do L.cctld's sell? I saw some good sales even at Moniker Live auction (I think it was a.gd).
thanks

 

[Ferman]

depends on cctld. if it sounds good then it is worth to reg
a.cctld
x.cctld