The name version is a great name but shortening it to just the letter V is greatest. You got some V In your wallet? V accepted here. Doesn't get any shorter.. Works like a £ or $ sign. Easiest to remember, looks awesome as a letter in it's self. My vote is for V.
That's an interesting suggestion to change the name from Version to V, but the symbol is already V and you can still say V accepted here. If you think that it's difficult to market Version, just imagine trying to market a single letter of the alphabet. I did a quick search, and there is no coin with just a letter as its name. I found a few such as Joincoin (J) and Revain (R), but although they may have a single letter representing them, they still are backed by a name and I believe that having an actual name of Version with the letter V as the symbol should remain as it is.
I agree with this - V as the symbol (and perhaps XVN as the ticker?), and Version or VersionCoin as the full name. I am still doubtful about Version - I dont think SEO can overcome the likely confusion with such a widely used technical term and it certainly wont help within a site like Bitcointalk - just try searching for Version within this section whereas VersionCoin finds it straight off. However, I dont feel really strongly about it and will happily go with the community view.