I've found VMware Fusion 5 is great, and far better than Crossover.
Fusion 5 runs all the relevant astro programs in a Windows 7 session and lets you share your mac folders and USB and LAN ports and network shares.
It can be run seamlessly so that I can use TheSkyX or Nebulosity3 yet still use DSS, RegiStax6 or AutoStakkert at the same time.
