Typing sites:

TypeRacer
TypingZone
Ultimate Typing Championship
TyprX
hi-games.net
NitroType
Intersteno
TyperA
Urikor
KeyHero
KeyBR
10-fast-fingers.com
RankMyTyping
I'm Typing
ARTypist
Other Keyboarding Resources

Noteworthy auto racing statistics sites (besides mine):

Racing Reference
Ultimate Racing History
Champ Car Stats
WSPR Racing
RallyBase

Scrabble sites:

National Scrabble Association
North American Scrabble Players Association
cross-tables.com
Aerolith
Quackle
Zyzzyva

Typing friends:

Jack Aviado (vonunov)
Bryan Bishop (kanzure)
Andrei Cristescu (Son)
Josh Duff (TehShrike)
Jason Hooper (nirgle)
Jelani Nelson (minilek)

Racing friends:

Patrick Wotton - Too Much Racing
Andy Miller - The Speedgeek
Brock Beard - LASTCAR

Scrabble friends:

Andy Saunders - Andy's Thoughts
Jeopardy! Archive - cofounded by Andy Saunders
Jason Katz-Brown
Seth Lipkin
Jesse Matthews