I use this plugin for technorati tags and it works well.
http://www.broobles.com/scripts/simpletags/
I haven't tested it yet on wp2.0 yet, but I have it running on a 1.5 installation at
http://www.camsexworld.com/blog/ Check a post, and view the source. You'll see the tags are there, and get indexed at technorati, but there is no anchor text for a traffic leak. I hacked the plugin a bit to remove that. It works out well.
I understand that technorati also automatically tags you according to category name as well when you ping them, so name your categories well.