I love the Opera Web Browser. It's the browser I use to check mail, read feeds and chat (yup Opera comes with an IRC chat client).
It's the one browser I can keep on for almost forever on my linux desktop without crashing or using up a ton of resources. If it does crash, it's intuitive enough to resume and launch the pages prior to it crashing. Firefox has that same feature now but I do recall Opera was first to introduce it (please correct me if I am wrong). In fact, tabbed browsing has been an Opera mainstay way before Firefox or IE had it.
If any geeks out there happen to have a Wii and would like to develop web pages on Opera, they might find this page helpful. I've always raved about the firebug on firefox combination for developers.
It seems Opera has a couple of nifty developer tools to challenge the dynamic duo of web development with its Developer Console and DOM Snapshot tools.