Comics and Entertainment
Norbert's Emulators – Centipede, Donkey Kong, Pacman and more (most predictably taken down)
Mini-Putt – flash-based miniature golf
2Dplay – mostly flash games
Crosswords
Washington Post Daily Crossword
Washington Post Sunday Crossword
Comics
Comics.com
Pogo
Sheepcomics
Stu's Comic Strip Connection
Other
Riddles including tech job interview questions