I'm using Opera right now. It has a lot of really neat features but mostly I use it because of its speed. On a dial up connection where the browser is mostly waiting for something to do you wouldn't notice the difference but I use DSL and I go nuts now when I use Netscape or MSIE. Opera is certainly more standards complient than MSIE and it holds its own against Netscape.
“The power of the Web is in its universality. Access by everyone regardless of disability is an essential aspect.”
—Tim Berners-Lee, W3C Director and inventor of the World Wide Web