I think opera have SDK released and there are some cool widgets that can be downloaded easily...
It has a progress bar at the bottom (which pops up) showing how much page is downloaded and the speed in KB/S which i think no other browser has.......
In built email manager is also cool.....
And i think it is the browser with zero security Holes
I heard explorer and Even Firefox broking sometimes... but not the case with opere
Opening in new tab, back ground tab,I think it is opera to first start the tabbed browsing.....
after using opera and then when i Use internet explorer I just feel like I have been using some very old browser.... Chrome is not at all cool as the opera....