I learned enough from all of your great suggestions over the past two weeks to finally tip me over the edge, and I'm now the proud owner of a shiny new MacBook Pro. The Parallels desktop was by far the favorite of all commenters for running Windows applications on a Mac so I plan to give that one a try this week so I can continue using my favorite genealogy software (although I am excited to also give some of the great Mac family tree programs a try). And I also found a neat new writing/organization tool for Mac called Scrivener (soon to be out for Windows) that seems to be very close to what I need to help me better write my client and personal research reports "as I go." I'm using Scrivener to organize and write up some research right now and hope to share more in the future about how useful it can be.
I'm still running Windows on my desktop so I really have the best of both worlds, but love my new Mac. Other than genealogy software (I'm going to try them all out), do you have any other suggestions for great Mac productivity tools or applications that I should try?