Over at InsideCRM.com they have a big list of small things that take only five minutes each and make your site better. The advice covers different areas of expertise.
The topics include copywriting, usability, SEO, design, and legal. The entries include a short description and a link to a lengthier article on the subject. Check them out at http://www.insidecrm.com/features/101-web-site-fixes-031808/