Don't Call Us - We'll Call You

Get rid of half the words on each page,
then get rid of half of what’s left
– Krug’s third law of usability

"Happy Talk Must Die" - Steve Krug, "Don't Let Me Think"

Some good resources for writing on the web and copywriting:

Charlie Morris http://wdvl.internet.com/Internet/Writing/
Jacob Nielsen http://www.useit.com/papers/webwriting/
Daniel Will-Harris http://www.efuse.com/Design/web_writing_basics.html

Copyblogger, Copywriting 101: http://www.copyblogger.com/copywriting-101/

Also see William Strunk, Jr. (Classic from 1918 http://www.bartleby.com/141/strunk5.html