Remember that a badly designed website can look bad on your company.
Dont publish the first design you come up with. Design it, and then throw it away and design it again, throw that away, then design it again.
By the third time it may start to look good.
Make sure you design it for a web browser of 800x600. If someone is using a bigger one, no problem.
Many people sit at a 19" monitor, design for that, and it looks awful on an 800x600 browser.
Dont use too many different colours.
Dont use too many different fonts.
Dont have any large images that take ages to download.
Try to use Cascading Style Sheets (CSS)
By a book like Web Design for Dummies (Make sure you get the new full colour one).
This will give you some things to think about when designing your site.
http://www.powells.com/biblio?isbn=0471781177