Cool web-development gizmo of the day: see a webpage as viewed in Safari on an actual Mac.

The site uses an actual iMac and returns screen captures of the displayed content, so you really do get to see the layout in Safari. You don't get to see anything more than a single screenful, and there's obviously no interactivity, but it's a whole lot cheaper than going out and buying a Mac just to realise that there's yet another browser out there that renders your content differently.