I'm writing this using the newly updated MyOperaExplorer widget (http://widgets.opera.com/widget/6021)/
It does not make the post any better but it can be convenient to keep this open in the corner of the screen to just add new posts whenever inspired.
Depending on the circumstances it might be more useful than a BlogThis! button added to the tollbar. By the way, is there such a button for MyOpera?
