Sites I Recommend

Online Generators

.htaccess Generators:
http://cooletips.de/htaccess/
Apace .htaccess file generator

Robots.txt Generators:
http://tools.seobook.com/robots-txt/generator/
Generate effective robots.txt files that help ensure Google and other search engines are crawling and indexing your site properly.

SEO Insight

Top SEO Sites for Beginners
SEOmoz.org
The Free Beginner's Guide to SEO provided SEOmoz.org has been read over 1 million times and provides the information you need to rank better.

---

Website Validators / Checkers

Redirect Checkers:
http://www.webconfs.com/redirect-check.php
Search Engine Friendly Redirect Checker

Google PageRank Checkers:
http://www.webconfs.com/google-pagerank-tool.php
Enter the URL you want to check and this tool displays PageRanks on top of all of the links on your website's page!

Helpful Web Development Resources

.htaccess Info:
http://softexpert.wordpress.com/2007/10/15/learn-htaccess-in-10-minutes/
Learn .htaccess in 10 minutes | Softexpert Moldova