Checklists I Have Collected or Created

SEO Checklist

Web Site Review Checklist

Web standards checklist

Color in Web Design

The ultimate website launch checklist

Sources

Essential Pre-Launch Checklist

25 Point Web site Usability Checklist

Further Reading

Read the Checklist Manifesto (if you have not already).

Excellent online checklist: Web Developer Checklist

Downloadable checklist: SEO Checklist for Web Designers

from NetTuts

Here are the checklist I setup when checking my own sites.

Front End and UI Checklists

Database Design Checklists

Website Code Checklists