http://www.google.com/googlebooks/chrome/index.html
Go to p19, where they talk about their tabbed UI design, and how each tab has its own URL box and controls .... "which around here we've been calling the OMNIBOX".
Go on, sue for trademark infringement. I would. I mean, as I sit here typing in an OmniWeb window, I couldn't possibly think that a browser innovation with a name prefixed 'Omni' as anything to do with you guys now, could I?