convert a PDF file to a Word document

http://www.hellopdf.com

convert text to speech easily

http://www.research.att.com/~ttsweb/tts/demo.php#top

http://www.spokentext.net

http://www.naturalreaders.com/

http://www.datafurnace.net.au/sayzme/html/home.html

http://clickspeak.clcworld.net/downloads.html

http://prt-i61.fernuni-hagen.de/~bischoff/radiopedia/index_en.html

http://applian.com/freecorder3/support/user_guide.php

file undelete utility

http://www.snapfiles.com/get/restoration.html

Learn Languages and practice with Native Speakers

http://www.livemocha.com/

How can I use wikis in education?

http://educationalwikis.wikispaces.com/

free statistical calculators

http://graphpad.com/quickcalcs/index.cfm

Interactive Statistical Calculation Pages

http://statpages.org/

flash based telephony

http://tringme.com/learnmore.php

convert rext to mp3 easily

http://vozme.com/index.php?lang=en

youlicit

youlicit meant to provide sites similar to the one being viewed.
http://www.youlicit.com/default.aspx