Posting this via OSX Snow Leopard 10.6.4 on my Hackintosh
Been using OSX for a few months on my Virgin connection with the Netgear WGR614 router, no problems at all. Wired Ethernet and Wireless work fine! STEAM also works as I've downloaded all my Half Life 2 games for MAC now and they play fine as well.
OSX only cost me £23 from Amazon, far far cheaper than Windows 7