Search the CONFOCAL archive at
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
Check out the very nice flash website about spatial scales (from angströms to ligh years !) here:
http://www.nikon.co.jp/main/eng/feelnikon/discovery/universcale/nano.swf
Reminds me of Charles & Ray Eames' "Powers of Ten" awesome movie (from 1977 !):
http://www.stage6.com/user/air44/video/2068223/Cosmic-Voyage-HD---(Power-of-Ten)
(divx plugin required, but it is woth it !)
Christophe Leterrier