Here's some very good news. The Mac version of ooVoo is now available for download from their web page (www.oovoo.com/download)! I don't have a Mac, unfortunately, so I can't try it out myself, but I know they have been working very hard on it, and doing a lot of testing before making this release, so I assume that it is the same high quality as the Windows version. I'd love to hear from any Mac users who try it.
Also, ooVoo has extended their "free telephone calls to the U.S. and Canada" offer, at least through the end of this month and up to a maximum of 500 minutes of calls. This offer is good regardless of where you are calling from, so it can be especially interesting for those who are calling from overseas. It is ridiculously easy to install ooVoo, and the call quality is good, so this is the perfect excuse to save some money and try out an excellent Video/Audio/Text/IM chat program, for either Windows or Mac!