MediaRemix: random software incl. paper computer which is very very very cool
icon basics: cool icons and site
Colour Problems: a web recreation of a 1902 colour theory book analyser thing...
Wiby: awesome search engine for classic web
Werner's Nomenclature of Colours: similar but this time all colour names - v cool
Half Life 2 Shading: a valve slideshow about half life two's shading
bibliotheca Augustana: a library of texts in ancient greek and latin and french and english and more
Mobile Phone Museum: mobile phone museum
YourSmileys: lots of animated emoticons
Tiny Tool Directory: a whole bunch of tools for a whole bunch of things
Texture Town: cool textures
Open RSS: lots of rss tools - feeds for diff sites
notes from earth: cool site
Marginalia: like wiby but broader
Panlexicon: like a thesaurus but cooler
Letters from the past: letters from the past
David Byrne radio: david byrne posts playlists more or less weekly v cool
Public Domain Review: online journal focused on work in public domain
National Geographic issues from the 90s: what the title says
Whole Earth Index: archive of the whole earth catalogue and others very interesting articles
Archive Fashion: i know nothing about high fashion but the magazines r cool
Standard EBooks: public domain ebooks very nicely formatted
METS: middle english texts
bitsavers: archive of old software, manuals, magazines, and so on to do mostly with nonconsumer computing