#1: Clarifying user requirements

#2: Collaborating

#3: Version control

#4: Basic system testing

#5: Usability

#6: System performance

#7: Comments in your code

#8: Logging

#9: Keeping your skills up to date

#10: Taking pride in your work

Via techrepublic

1. If your site's content can be turned into a widget somehow
2. Do NOT: have a public link exchange on your site, sign your site up on link farms or on SEO directories
3. Though CSS can replicate the styling brought from these tags, search bots love them
4. Make sure your site supports the big four: Internet Explorer 6+, Firefox 1.5+, Opera, and Safari.
5. Make sure your site fits down to a 1024 x 768 monitor resolution.
6. Use the color wheel when creating layout themes. Try to keep your site layout down to three distinct colors.
7. Create a website shell (a.k.a. template), so that if you decide to make another website down the road, it will be a lot quicker to make because you'll already have a framework set up.
8. Create a to-do list for your site so you don't forget anything as it grows bigger
9. A successful website provides a service to its users
10. Whenever possible, use onmousedown instead of onclick - it's ~100ms faster.
11. Use file compression for your javascript and web page files so that your pages load faster
12. If you have a rails site, I suggest checking out Mongrel and Monit for Mongrel (or God) if you are currently using Apache with FastCGI.
13. This one is more of a for-your-health point, but our eyes naturally look slightly downwards

Via matts411.com