URL Manipulation and Server Issues

1. Regular Expression Guide for SEOs
2. Regular Expression Tutorial
3. Regular Expression Generator for range of IP addresses
4. Apache Tutorial: .htaccess files
5. Server Side Includes (SSI)
6. Check Server Header
7. Mod_Rewrite and Regular Expressions
8. Regular Expression HOWTO
9. ISAPI Rewrite
10. Official Apache Module mod_rewrite
11. Mod Rewrite Forum
12. Class C Checker Tool
13. Google Data Center Multiple IP Address SEO Research Tool
14. URL Rewrite Tool: search engine friendly Urls
15. Hot-linking checker tool
16. Official Google Webmaster Central Blog: Dynamic URLs vs. static URLs
17. Dynamic URLs vs. Static URLs
18. htaccess, 301 Redirects & SEO: Guest Post by NotSleepy
19. If-modified-since header
20. Canonical URL Tag
21. Maintenance Mode Plug-in- Use this plug-in to show Google 503 status if your CMS is wordpress.
22. Simple URL Shortner
23. What is my IP address?
24. How do I change my IP address?
25. 10 awesome .htaccess hacks for WordPress

For more visit http://seohimanshu.com/killer-seo-sem-tools/