Joost de Valk is a professional SEO, who had written an very interesting guide about how to optimize your WordPress blog.
In this WordPress SEO guide you will find very important tips to improve your ranking with simples techniques.
Here are the topics
1. The basic technical optimization: simplest stuff, highest rewards

Permalinks
Optimize your Titles for SEO
Optimize your Descriptions
Optimize […]

Another WordPress version is now available. This version (2.5.1) includes more over 70 bugs fixed (you can see the list here).
Some features:

Performance improvements for the Dashboard, Write Post, and Edit Comments pages.
Better performance for those who have many categories
Media Uploader fixes
An upgrade to TinyMCE 3.0.7
Widget Administration fixes
Various usability improvements
Layout fixes for IE

Download update […]

If you are a WordPress designer and want to sell or promote your job, I’ve compiled a list for it.

http://www.finthemes.org
http://board.themevibes.com/wordpress-themes/
http://dinothemes.com/
http://forums.digitalpoint.com/
http://forums.ukwebmasterworld.com/
http://freewpthemes.info/
http://hostbidder.com/
http://ithemes.org/
http://templatenavigator.com/
http://themebot.com/
http://themes.blogflux.com/
http://themes.iwebnet.org/
http://themes.mygreencorner.com/
http://themes.rock-kitty.net/
http://themespack.com/
http://web2feel.com/
http://webtalkforums.com
http://wordpress.mu/
http://wordpressgallery.com/
http://wordpresssite.com/
http://wpskins.org
http://wptemplates.org
http://wptheme.net/nt-velvetcubes
http://www.9mb.com/forums/
http://www.adminfusion.com/forums
http://www.affiliatelink.org/
http://www.allnukestuff.com
http://www.bgthemes.com
http://www.bloggeries.com
http://www.bloggingthemes.com
http://www.blogoxide.com/
http://www.blogskins.com/
http://www.board.themevibes.com/wordpress-themes
http://www.csschat.com/
http://www.designerstalk.com/forums
http://www.devhunters.com
http://www.deviantart.com
http://www.estetica-design-forum.com/
http://www.experienceadvertising.com/forum/
http://www.freehostforum.com
http://www.freelayouts.com/
http://www.freewordpressthemes.com/
http://www.freewpthemes.info
http://www.fresheezy.com/
http://www.iguides.org/forums
http://www.iiera.net/forums
http://www.ithemes.org
http://www.johntp.com/wp-skins/
http://www.loreleiwebdesign.com
http://www.mygreencorner.com
http://www.namepros.com/
http://www.nameslot.com
http://www.nowg.net/
http://www.osskins.com/
http://www.phproxyskins.com
http://www.satinder.net/themes
http://www.sponsoredtemplate.com/
http://www.talkdev.com/
http://www.talkfreelance.com
http://www.talktheme.com
http://www.talkthemes.com/
http://www.templatenavigator.co
http://www.templatesforums.com/
http://www.thatsprofound.com/
http://www.themeboss.com/
http://www.themebot.com/
http://www.themehq.com
http://www.themereleases.com/
http://www.themes.blogflux.com/
http://www.themes.iwebnet.org
http://www.themes.rock-kitty.net
http://www.themesbase.com
http://www.themespack.com
http://www.themestudio.us/
http://www.themes-wp.com/
http://www.themetube.com
http://www.thewebmasterstop.com
http://www.top10wordpressthemes.com/
http://www.toptut.com/
http://www.topwordpresstheme.com
http://www.v7n.com/forums/blog-themes/
http://www.web2feel.com
http://www.webdesignerforum.co.uk
http://www.webdesignforum.com
http://www.webdeveloper.com/forum/
http://www.webdevforums.com/
http://www.webmasterarena.ws
http://www.webmaster-talk.com/blog-themes/
http://www.webtalkforums.com/
http://www.widgetreadythemes.com/
http://www.wordpressgallery.com/
http://www.wordpresssite.com
http://www.wordpresstheme.in/
http://www.wordpressthemed.com/
http://www.wpflx.com/
http://www.wpskins.org
http://www.wpsnap.com/
http://www.wptemplates.org/
http://www.wptheme.net
http://www.wptheme.org
http://www.wpthemesarchive.com
http://www.wpthemesfree.com/

Please let me know about others sites to add into my list.
Share and enjoy!!

I’ve just compiled some interesting tools, resources and tips for Wordpress.
How to separate trackbacks from comments: Michael Martin from ProBlogDesign.com wrote this interesting tip to separate human comments from automate pings.
How to differentiate author comment: Charity from DesignAdaptations.com wrote an useful tutorial about it.
RSS Sticky: This plugin allows you to add copyright or download to […]

Many bloggers ask me via email how to build a good SEO (Search Engine Optimization) Url on their WordPress.
If you want to optimize your WordPress urls you have to follow these steps:
1. Login into your WP administrator
2. go to Options then Permalinks
3. Under Common options: click on Custom, specify below and then add /%postname%/ […]