Goodbye Futhark, hello Carakan.
And of course there are features. One important one is HTML5 video. Opera supports the Ogg Theora technology favored by Mozilla in Firefox but not by Apple in Safari; Chrome supports both Ogg Theora and the format Apple prefers, H.264.
My personal favorite Opera feature is Turbo mode, which uses the company's servers to deliver lightweight versions of Web pages to those suffering slow Net connections. Generally I find Opera fairly snappy to use, including my tests today with the final version of 10.5.
Others include visual previews of tabs, which I switch off since it find it harder to keep my place when shuffling between tabs; Opera Link to synchronize data such as bookmarks and history among different computers; mouse gestures to control the browser navigation with swipes and sweeps rather than clicks and button presses; Speed Dial to populate otherwise empty new-tab pages with useful material such as favorite Web pages; built-in BitTorrent support; private browsing to keep traces of where you've been off your computer; and the newer Unite service to share video, audio, or other information directly from your computer.
The Windows beta preceded the Mac OS X and Linux versions, and it appears Opera is using the same timing for the final release of 10.5
Opera accounted for about 2.4 percent of the browser usage in February, fifth among browsers, according to data from Net Applications.