How to use the WordPress image uploader to create thumbnails.: Brian explains how to automatically generate thumbnails (and resize images into various sizes) for your pictures using the WordPress image uploader.
How to embed WordPress functions outside of WordPress.: WP Engineer explains how to embed WordPress functions into code that is outside of WordPress. This can be very versatile and can help extend the usefulness of any WordPress install but would obviously require custom code.
How to widgetize your page menu in WordPress.: Justin explains a simple method to widgetize your menu of pages on your WordPress blog. Once you do that, the page menu can be treated as any other widget.
Reality Check: You are not going to make money from your blog.: Penelope’s interesting take on the views of the numerous MMO blogs out there and worth a read for everyone thinking of making a ton of money from blogging. I can attest that it is very hard to do and requires a lot more than just luck and perseverance for the rest of us, especially if you want to hold on to your principles and do the right thing.
WordPress.com: Comment reply via email. Now you can reply to comments on a WordPress.com blog just by replying to emails. This feature would be fantastic on hosted blogs but I can only presume the amount of setup and maintenance it would require.