The Short Version: The Philips VOIP0801B/37 Skype Phone is not fully compatible with Skype and Mountain Lion. The microphone and speaker work fine but the keypad does not.
I’ve had a Skype account for some time though I’ve never used it very often. In general, it serves as little more than a backup calling system. I’ve been thinking about using the service more often at home so I decided to try to find an inexpensive device that would serve as a dedicated Skype phone.
Earlier this week I received a Philips VOIP 080 Skype VOIP Travel Phone (VOIP0801B/37) that I purchased from Amazon for about $30. Unfortunately, I should have read several of the reviews more closely when trying to determine whether or not this would actually work with my Mac (10.8 Mountain Lion).
It partially works. The Mac recognizes the device connected via USB and the Skype software can be configured to use the microphone and speaker. However, the keypad appears to be useless. Dialing, etc has to be done from the Mac.
Before I purchased this I was well aware that Macs were not officially supported but I had the impression it would actually work. Perhaps I’ll stumble upon some trick to get the keypad working with the Mac but for now I’m stuck with a device that doesn’t work as I had hoped because I didn’t research it adequately.
Updated 07/06/2014: In the end I was never able to use it as I had intended. It’s now in our collection of yard sale items.
Press Any Key 
Have you ever found a phone to replace this? I’m in the exact same situation – but I’m unable to find a good phone that works with Skype/Mac.
Unfortunately I have not though I gave up on it after a while so it’s possible there is something out there that I’m not aware of. I was a bit surprised that Skype itself did not offer something like this, but better, via its website.