E-Commerce guidelines Design guidelines for e-commerce sites to improve effectiveness and usability of e-commence sites. This is an expense study, but very useful.
Home page usability guidelines Jakob Nielson is a leading expert in designing web sites that are functional. This is an article by him entitled "Top Ten Guidelines for Homepage Usability."
Spell Check your web pages FREE spellcheck system and script to check the spelling of either your url or written documents. Includes Multi-lingual support.
Java and Java Script helps
Dynamic Drive Features a DHTML code library with original components and scripts.
Web Monkey Provides resources for Web developers including information about authoring, programming, design, multimedia, and e-commerce.
The 24 Hour HTML Cafe This site is the companion site for the book Teach Yourself HTML 4 in 24 Hours by SAMS.This is a good book and a good site.
The Color Wheel Company Provides some good information about how to correctly use color on your site. They explain the properties of color. The Web Wheel will help you develop compatible color schemes.