Or am I overlooking something?

MAC's frontend can use WavPack (in fact, a copy of WavPack is bundled with MAC). It's listed in the help file under Interface Reference > Compression Modes > External > Lossless > WavPack. To compress using WavPack, click the drop down arrow next to the compression level in MAC and select External > WavPack > Fast/Normal/High. Then you can encode your file(s) exactly as you would using Monkey's.

I thought he meant Mac like this...? And I don't think there's any Monkey's Audio GUI for OS X. (Nor do I know of any for WavPack, but then I just don't know.....)

Ahh, my mistake. There's a Wavpack binary for OS X, but no frontend GUI.

The latest versions of xACT include limited WavPack support (lossless format only and choice of high or low compression) and have shntool's WavPack version check disabled thus negating WavPack 4's incompatibility.

EDIT: xACT has of course had APE support for quite a while now.

Excuse my ignorance, i dont use MAC's but i wondering what audio players you are using to play wavpack.
It took me ages to find a plugin for linux to playback wavpack, ive not even started to look at ripping yet. i digress..

but it does seem that for such an excellent open source format its amazingly overlooked on platforms other than windows.

why is this?

Cog or xist (sorry, can't find a working link)

I actually tried xACT for wavpack ripping once and the results were atrocious. Definitely not lossless. Even posted on their yahoo forums and was told that the kinks still need to be worked out for the wavpack support.

So, for now, their still isn't a "stable" Mac frontend for the best lossless codec.