A newer version of Opera is available.Or, Learn More About Opera
Full user review
"The best browser bar none."
Great default featureset
Available on most platforms
Syncs data to all platforms
Great HTML5 support
Tiny download (10MB) 1/4 the size of other bloaty browsers
Mail client is REALLY good, and does RSS and Newsgroups
Development tools (Dragonfly) makes Mozilla and Google's offerings look rather pathetic in comparison.
Not as many extensions are other browsers, but most of the good ones are already included as main functionality.
The king of browsers. It's what everyone should be using in a ideal world where money doesn't talk.