The Next Little Letter: The Vowels of the Internet (idea)

then "i" (internet)
iMac (the artsy fartsy Mac users dropped the hyphen!
again setting the standard for good taste)
iDrive
iBook

then with empowerment and mass approval came "u" (you)

uBid
uShop
u-completely-forgot-about-anything-the-net-is-good-for-except-shopping-because-nothing-else-is-quite-so-profitable

So onward to the future as of early September 2000

Nobody wants to use "a" because that would imply one in many which simply is counteractive to all brain conditioning, er, marketing campaigns.

aBadInterface
aSpitInTheOcean
aNotherBrickInTheWall.gov

My prediction: the next letter is either "o" for (online), though this is a bit synonomous with "e" right now
oBusiness
oServices
oMyBrothers

Or perhaps "y" as the intellectuals regain control of the internet:

y-AreYouDoingThisToYourself.edu
y-LeaveTheHouseEverAgainExceptToStrollInTheParkOrPlayGames