[Tekhne]

I second that. I'm a vim lover anyway, but vimperator has been awesome for me. I had RSI problems and this really helped me to reduce my usage of the mouse. Like vim, there's a learning curve, but there are very useful corners to explore.

[lowkey]

Tried VIMperator and loved it but had to kill it since it was incompatible with Gmail keyboard shortcuts.

[jokermatt999]

Hit ctrl-z to pass through keystrokes. It works with Google Reader, but I'm not 100% that it works with Gmail. I know the issue has been discussed before, and I think it was fixed, but I'm not certain.

[Tekhne]

You're right. In fact, I have my vimperator setup so that it automatically does this for Google Reader and GMail, and only for the relevant tab (i.e. if I hit "v" to view a Reader article, the pass-through turns off on the new tab). I did it with this statement in my .vimperatorrc (Linux):

autocmd LocationChange .* js modes.passAllKeys = /(google\.com\/reader|mail\.google\.com)/.test(buffer.URL)