Google Chrome (Mac) set keyboard focus from address bar back to page
This has annoyed me very much too. Using tab is not always desirable, for example when you're reading a large document. Tab could move away from where you were reading to the first link on the page.
I have found a work-around for the missing hotkey inspired by some of the answers from here: In Mac Chrome, how can I return focus from the address bar to the page?
Edit: Apparently this still gets upvotes. If this really bothers you please let the chrome devs know here: http://code.google.com/p/chromium/issues/detail?id=92885
On Windows at least, I've been using F6 to switch between the URL bar and the rest of the page, also for the purpose of using Vimium. I am not sure if this works on OSX or Linux.
F6 cycles between keyboard accessible panes such as the URL bar, bookmarks, the page itself, and downloads. I generally keep downloads and bookmarks hidden, so F6 acts as a toggle. It's not nearly as clean of a solution as a dedicated "focus to the page" button would be, but I've found it workable.
The best way for me is never using Chrome's URL bar, and always use Vimium's open URL hotkey, which is O by default.