To explore anti-mass frameworks, there are several useful texts available online. One is

The Anti-Mass: Methods of Organizing for Collectives
by the Red Sunshine Gang, Berkeley, CA 1970
Full text available at
http://ickevald.net/resistance/anti-mass.htm
or also
http://myweb.tiscali.co.uk/blackchip/antimass.htm

The pamphlet Collective Organisation
by John Englart
http://www.anarres.org.au/essays/amje1.htm

considers anti-mass organizing as well.

For titles with summaries, I'd suggest looking at the AK catalog: www.akpress.org, which has both Anarchist and Situationist sections. This could be useful as the anti-mass pamphlets mentioned above seem to be cited a lot in anarchist and situationist literature web sites.

Guy Debord's Theory of the Derive elaborates on a social practice of drifting through varied ambiances either alone or in very small groups.
http://library.nothingness.org/articles/all/en/display/314

Library at Nothingness.org: has a variety of anarchist and situationist texts online, including excerpts from Situationist International
http://library.nothingness.org

If you want to take a more thorough look at Foucault's work, try
http://foucault.info/ has a number of full text excerpts

The site http://www.theory.org.uk/ctr-fouc.htm has an extremely thorough exploration of Foucault's life, work, and its influence, and is a generally great site for exploring critical theorists, their ideas, work, and influences.

A book mentioned here is Foucault: the Legacy, ed. Clare O'Farrell
More detailed info on this book here
http://www.michel-foucault.com/legacy.html

I hope this helps!