About 20% of computer users have monitors set to 800 x 600. Make sure your website works well for them.
http://www.onestat.com/html/aboutus_pressbox38.html
WARNING - Dust-Off compressed air spray for cleaning computers should never be inhaled:
http://www.snopes.com/toxins/dustoff.asp
WINDOWS KEYSTROKES & TIPS - getting the most out of your Windows keyboard:
http://www.internet4classrooms.com/winkeyboard.htm
CSS AND LISTS - one of the great things about CSS is the way it can be used to transform a list into a useful menu. There are many ways of doing this, and the examples on this page show you what is possible:
http://www.webreference.com/programming/css_style2/
SCROLLBARS: Jakob Nielsen's latest Alertbox highlights poor scrollbar design:
http://www.useit.com/alertbox/20050711.html
FLASH: while maybe many of these Flash effects fall into the category of 'because I can', there could well be creative applications for some of these ideas within a children's or other sort of outreach site.
http://www.actionscript.cl/
USING COLOR. Colorcombos will grab colurs you like from any website:
http://www.colorcombos.com/
and WebDev offers color use tips:
http://www.webdevelopersnotes.com/design/17.php3