Opera Unite : United we will remain 4eva
No matter how much is written about this wonderful little browser, it would always be less than what anyone and everyone could say about it. Been using this just another browser for around 4 years now and it’s the most important part of my online life. Friends come and go but not opera 
Opera 9 already had so many extra features(hmmm…read end note 1) , performance and stability that it would have take any other browser at least years to come at par with it and if it was not enough, opera has just moved out of this browser-race to an al-together higher level where no mortal browser would ever dare to tread with its launch of Opera Unite - Opera 10 beta - a really promising way to share files without using any server just the way p2p file sharing works. sounds cool.
oh..ran out of time.. check dis
Have fun exploring http://unite.opera.com/
End note 1:
synchronizing history/bookmarks/notes everything using opera link syncronization
saving sessions;
keeping notes (i wonder how google notebook survived for so long before closing down a few weeks back)
fast speed with several tabs
torrent client
quick image turn on/offser mode to remove formatting of pages
..to name a few used by me more often than not
