Just a note that the Performancing plug-in for FireFox was not included in PayPerPost's acquisition of the rest of the Performancing portfolio and the add-in has been renamed ScribeFire. There's not much on the new site (just a welcome page) but more info is promised.
If you use Firefox and blog, this is an add-in you should take a serious look at. An number of blog engines including WordPress, TypePad, LiveJournal, and MSN Live Spaces are supported. Even if you choose not to connect it directly to one of these blog engines, it's a dandy composition tool from whcih you can copy and paste nicely formatted HTML. ScribeFire also has hooks to your del.icio.us account and Technorati.
Hat tip to downloadsquad