Some useful resources for webmasters and marketers

Here's a list of some resources, websites / software that may be useful for webmasters and SEO
marketers.

http://www.webmasterworld.com
Great resource for webmasters, technical and marketing forums.

http://www.copyscape.com
Allows to search the web for copies of your website.

http://home.snafu.de/tilman/xenulink.html
Xenu's Link Sleuth allows to check a website for broken links. Download and install the
software on PC.

http://validator.w3.org
Validates your HTML code.

http://www.archive.org/web/web.php
Website archive, allows to find and display old version of a webpage.