Not a fan of the new icon... I just don't think it suits them as much as the old one. Their homepage is about the cleanest, simplest, sparsest thing on the web, and that's what's great about it. The new g just looks over-designed and too stylistic.
Old G was a good representation - simple, solid and strong. New g... the same cannot be said.
Luckily the icon in the search bar for Firefox hasn't changed, and I don't notice the tab icons too often - Google tabs tend to stay open only as long as it takes to find the thing I'm after in the results.