Odds and ends
- Martindales's The Reference Desk has been said to be 'eclectic and oddly complete'. It's that and so much more.
- Miscellaneous Mathematical Utilities
- NoodleTools (a different kind of search engine)
- Gimpsy (a directory of sites that let you 'do somthing')
- Science Fiction and Fantasy Research Index (over 55,000 items)