Skype incompatible with Vista

It is amazing that this long after the delivery of Vista, neither Microsoft nor Skype has addressed the problem of the popular Skype VoIP app's incompatibility. Many PCs are being delivered with Vista preinstalled, to just the sort of customer who would want to use a broadband connection for either cheap or free phone calls.
The Skype download website carries no warning about this, though Vista is not listed among the compatible Os'es. This is in contrast to Windows 98 and ME; there is specific advice in both cases. But for
Vista users - zilch!
In contrast, downloaders of the competitive Sipphone Gizmo Project are advised to right-click the installation file and choose XP-compatibilty. It would be interesting to know if this technique would work with Skype.
The Gizmo has more functionality than Skype, including the ability swap I'M texts with other messaging systems, and even connectivity with at least one oter VoIP provider.
It would be interesting to know if Skype-badged hardware will work with Gizmo, and also if such hardware carries a "Vista-incompatible" health warning.
Comments from readers are invited.