Typing and computer sites:

TypeRacer
TypeRacer Database
TypingZone
Ultimate Typing Championship
TyprX
hi-games.net
NitroType
Intersteno
TypeGun
TyperA
Ratatype
Urikor
KeyHero
KeyBR
10-fast-fingers.com
ARTypist
TypingWeb
Other Keyboarding Resources
A History of Typing and the Evolution of the American Keyboard
Keyboarding Education For The College Student
Internet Technology Glossary for Kids
Business Skills: Keyboarding Business Keyboard Skills
Wrist, Hands and Fingers: Proper Typing Techniques
Spectacular touch typing tips (e-book)

Noteworthy auto racing statistics sites (besides mine):

Racing Reference
Ultimate Racing History
Champ Car Stats
World Sports Racing Prototypes
RallyBase

Scrabble sites:

North American Scrabble Players Association
cross-tables.com
Aerolith
Quackle
Zyzzyva
Word Tips Unscramblerer

Typing friends:

Bryan Bishop (kanzure)
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