SEO
Become an SEO-friendly web developer. Use your knowledge of HTTP to fix on-site issues.
- On-site SEO
- http://www.seomoz.org/learn-seo/on-page-factors
- http://www.seobook.com/learn-seo/on-page-seo.php
- Redirects, rel-canonicals
- http://www.seomoz.org/blog/301-redirect-or-relcanonical-which-one-should-you-use
- HTTP status codes
- http://www.seomoz.org/learn-seo/http-status-codes
- http://www.flickr.com/photos/girliemac/sets/72157628409467125 (slightly in jest, but the descriptions on each photo are quite good)