I ran across this downloadable and printable SEOmoz Web Developer’s SEO Cheat Sheet today, and I’d suggest you make yourself a copy and keep it somewhere close by. The cheat sheet covers many of the important rules and best practices for SEO web development, which includes:

• Important SEO HTML Tags
• Search Engine Indexing Limits
• Recommended Title Tag Syntax
• Common Canonical Homepage Issues
• 301 Redirects for Apache
• Important Search Engine Robots
• Robots Meta Tag
• Common Robot Traps
• Robots.txt Syntax
• Sitemap Syntax

If you hire someone to do web development for you, you may want to pass this list on to them. Making sure your site is built properly can make a night and day difference in your search engine rankings, so do what you can to make sure things are built right in the first place.

Here’s a link to the PDF, and here is a link to the SEOmoz post about the sheet.