Have you multiple keyboards and mice for managing multiple machines and would prefer to have just one of each ? The developers of Maxivista which I have mentioned before have launched ShareMouse which is a cross platform (Mac / Windows) keyboard and mouse sharing solution. Rather than say using a USB switch (they don’t work terribly well). You can also drag and drop files between machines.
I do suspect that Maxivista may not make it to windows 8 – but ShareMouse may be a useful alternative for productivity.