Flock Browser
I went ahead and tried out Flock. If you haven't already give it a try. Firefox with a theme and some extra features. It's geared for people that use the web alot and specifically blog,flickr, etc. You can read a nice indeph review over at PaulStamatiou. My thoughts are that the blog and del.icio.us integration is quite nice. On the otherhand I'm unsure if a new browser is necessary. I would much prefer it to be extensions/themes/plugins for the actual Firefox.