These sites did clever things to get their names between my holy balls.
Most of them have now gone to the Great Train Depot in the Clouds.

Owen's Transport Tycoon Station

TT Forums

openttd.org

TTDPATCH - Josef's admirable contribution to keeping TT alive

I have removed the links to other sites. They change more often than I change my underwear - sometimes up to once a month! The best way to find TT sites is to browse the web ring list.