[SkyMarshal]

Opera lets you bypass the anachronistic 'tab' metaphor completely:

http://imgur.com/XuMkx.png

Use Ctrl-Tab to switch between tabs the same way you Alt-Tab between windows. Close a tab with Ctrl-F4, similar to closing windows with Alt-F4.

Firefox with Vimperator does even better - t to open a tab to a url or search string, d to close a tab, Ctrl-n and Ctrl-p to tab between them.

Of course, Chrome's Vim extension replicates similar functionality. Either way, reducing mouse-keyboard context-switching is useful.

[pkamb]

A trackpoint is my way of reducing mouse-keyboard context switching :)

[clawr]

Also, right click + scroll

[jpr]

Do you know if there is a way to quickly jump to a specific window in Opera, with a strings search, like in Vimperator? This would be really nice.