Over on my Voxeo blog site, we are using WordPress MU which is based on WordPress 2.3 and includes a very nice "tags" feature in addition to categories. This allows you to do things like have the "tag cloud" that you can see in the right sidebar of our "Speaking of Standards" blog. It's quite nice but in working with the blog site, we ran into one major annoyance - none of the offline blog editors on the Mac seemed to support WordPress 2.3 tags. This resulted in a bizarre posting process where if you wrote the post offline you then needed to login to the site to go back and add tags to the post. Thankfully, a quick search brought me to a post back in September indicating that marsedit already supported WP 2.3 tags! All that is required is to go into the View menu (when writing a post) and choose "Keywords Field". When you enter in keywords, those are then automagically mapped to WP 2.3 tags when you publish the post. VERY nice!