If one ever gets made, then it’ll appear here and I’ll happily switch back to Safari now that 5 has it’s progress bar and snappiness back. Otherwise I’m sticking with Chrome.

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EDIT: There’s been quite a bit of traffic to this little post and as has been correctly pointed out in the comments you can get a SIMBL plugin that very cleverly makes Safari play like Chrome. Work fine in Safari 5.1 on Snow Leopard, and is supposed to support Lion too.