Two options to run Microsoft Windows applications on Intel-based Macs were updated in the past week.
Parallels Desktop for Mac Release Candidate 2
Earlier versions of Parallels would not run on Intel Macs with more than 2GB RAM. That limitation is gone. And, of course, Parallels can run more than just Windows XP as a Guest OS. Linux, and other OS types run fine in Parallels Virtual Machines.
CodeWeavers CrossOver Mac Beta 2
CrossOver Mac is based on the WINE technology (and not a virtualization solution like Parallels). I had some issues when I tried Beta 1. I’m looking forward to spending some time testing Beta 2 later this week.