Lynn Hershman is an interesting Performing Artist, and Heart fine art is a fantastic resource for catalogues of historic and contemporary artists' books, print, sound and object multiples, unique works and documents related to the various international avant-gardes.
 
http://www.lynnhershman.com/
http://www.heartfineart.com/

Concrete Poetry Links

http://www.rediscov.com/sackner.htm

http://www.ubu.com/

http://library.thinkquest.org/11883/data/concrete.htm

http://janeecake.home.att.net/concrete.htm

http://quest.arc.nasa.gov/aero/wright/teachers/wfomanual/langarts/poem.html

http://cadre.sjsu.edu/switch/sound/articles/wendt/ng1.htm

http://www.imagix-research.com/priya/art01.html

http://jdc-concrete.com/READING.HTM

http://www.britannica.com/bcom/eb/article/2/0,5716,25512+1,00.html

http://ourworld.compuserve.com/homepages/ThomasNagel/HISTORY.HTM