Ever since Opera went freeware several years ago, I’ve always enjoyed how briskly it performed while including numerous powerful new features.  I want to use it as my everyday browser, but there are still the unfortunate few sites that act up on it or actively block access due to not officially supporting it (at least just offer a warning and give me some way to test the waters myself!).  Every so often, I even fire it up on my Android G1 when I need to go to a graphic-intensive website while on the go.  

Check out their 15th anniversary website for a trip down memory lane.

Cheers, Opera!  Keep up the good work.