Notthingness: Situationist International archives (E/FR) - The website of Notthingness.org is probably the oldest websource on Situationist texts, icluding al lot of integral texts, both in english and french. Hasn't been updated lately, but still deserves a visit

Not Bored (E)- an anarchist, situationist-inspired, low-budget, irregularly published, photocopied journal. On the website a great Lettrist International archive (1950-1957) and a Situationist International archive (1957-1972) both with a lot of english translations on SI en lettrist texts. Don't miss the interview with Lefebvre on SI (although he doesn't have all the facts correct, still worth the read)
Not Bored also offers some SI stuff for sale. Also some pages on the New York psychogeographical association

Bureau of Public Secrets (E)- among other things a Situationist International Anthology with translations in english of key texts and filmscores. Especially great because it offers a complete translation by Ken Knabb of Debords The Society of the Spectacle and a great survey of Guy Debords films and filmscripts

Situationist International Online (E) - Probably the most complete archive in english (or otherwise) at the moment. Pre- SI texts including a complete translations of all Potlatch issues, COBRA manifestoe, texts by Jorn's international movement for an imaginist bauhaus, Post-SI includes Debords notes on Wild Architecture. And a really great chronology.

Mital-U (E) - Some text on lettrist, but noable for the introduction (and lettrist and SI relations) on DaDa

Situationist Bibliography (E) - Seems to be updated untill around 1998, but apart from that a great list of relevant literature.

Kaldron Lettriste pages (Fr/E) - text and portraits of lettrists old and new.

Scandinavian Situationism (E) - Mostly text by/on Asger Jorn and SPUR and a usefull addition on other sites which tend to forget Jorn's contribution.

Debordiania - (Fr, E, +) subtitled 'Oeuvres Completes de Guy Debord / Complete works of Guy Debord' it largely does what it promises to do. Not only in French en English, but also in Arab, Danish and German. Lots of links to original text, some of them dead unfortunately.

Socialfiction.org - (E / NL) Dutch website devoted to psychogeography, urban exploration and all things related, including some great links.

Kazil - (E) Great reports on a number of Rotterdam based adventures.  

Urban Drift - (E /D) ' A transcultural platform for new tendencies in Architecture, Design and Urbanism' , as the call themselves, they do however seem to get the drift.

Blogs - lots of urban drifts are recorded in weblogs. By nature these logs are rather evasive and sometimes hard to find. You could try links at Glowlab, Kazil,

New Babylon (E) - Report on the conference on New Babylon 27/28 jan 2001 in Delft (NL)

Constant Nieuwenhuis - Section of the Not Bored website, including some photographs and translations of key Constant texts. 

Full versions of Raoul Vaneigem 'Traité de savoir-vivre à l'usage des jeunes générations", (1967) / On the Poverty of Student Life
French - English -

Raoul Vaneigem ' The Revolution of Everyday Life'
English -

Spunk Library - (E) The Spunk Library collects and distributes literature in electronic format, with an emphasis on anarchism and related issues.

Luther Blisset - (E / I/ Es) WEbsite of Italian pranksters and authors of 'Q' that once used the penname Luther Blisset and have since been operating under names like the Wu Mingfoundation

Fluxus.org - (E) Could be a great portal for all artists involved in the Fluxus movement, bt half of the links are dead. The other half isn't so try your luck.

Willem de Ridder - (NL) website of Dutch Fluxus artist, master of the art or storytelling and recent inventor of Spiegelogie Willem de Ridder. Unfortunately the English version is still waiting...

Indymedia - (E) The independent Anti- No- or OtherGlobalist news and mediacenter.