When I hit 't', the new tab opens not with the default New Tab page where focus is on the address bar, but with my home page (iGoogle), where the focus is on Google's search field.

This means I can't just hit 't' and type a URL. A small nit-pick I know. I've just looked at the source, and it seems a problem with Google's API call (chrome.tabs.create). It is supposed to default to the New Tab page unless a URL is provided (and vimium does not provide a URL). On my install the home page is opened instead, so this is not Vimium's fault (and I'm very happy with it thus far).

Haven't tried it myself, but I assume he means opening up a link (via hint) in a new tab.