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Lions Go Roar » Update Notifier
Update Notifier is a WordPress plugin that sends daily email notifications to the admin if there is a new version of WordPress available for download. Notifications about updates for plugins and themes can also be sent.

Geeky bits in WordPress 2.9 – Yoast
A list of all upcoming interesting features of WordPress 2.9 for developers and users.

Web Design WordPress function list
A nice ordered list about WordPress functions. It can be helpful in parallel with the codex.

Sidebar (widget area) descriptions in WordPress 2.9
WordPress 2.9 will allow theme developers to add a description for each widget area. Here is how to add it

20+ Brand New and Incredibly Useful WordPress Plugins – Nettuts+
A list of 21 Useful WordPress Plugins, from styling to security.