SEO toys and widgets

This is not a definitive list - but I was asked by someone in the office for a few things to play with, this is what I gave them. I am sure I should look for some more.

Any suggestions?

There are many free tools and information sources.

Here are some things to consider reading, looking at. Each have their own pros and cons and levels of genuine knowledge.

Things to Read
http://www.webmasterworld.com/
http://searchenginewatch.com/
http://searchengineland.com/
Googles own blog http://googleblog.blogspot.com/
http://www.mattcutts.com/blog/
http://www.seochat.com/
http://forums.seroundtable.com/
http://www.daggle.com
http://www.highrankings.com/
http://www.internet.com/
http://www.webproworld.com/

Keyword Tools
https://adwords.google.com/select/KeywordToolExternal
http://inventory.uk.overture.com/d/searchinventory/suggestion/

Different tools
http://tools.seobook.com/

Google datacenter comparisons
http://www.microsano.org/microsano/bigdaddy.php
http://www.seochat.com/seo-tools/multiple-datacenter-google-search/
search and you will find many

Fun
http://www.gahooyoogle.com/

Duplicate content free checkers
http://www.copyscape.com/
http://www.webconfs.com/similar-page-checker.php

Spider simulator
http://www.se-spider.com/