Remember the Tareyton ads in which the models proclaimed they would "rather fight than switch"?
While it wouldn't be hard to find users on either side of the PC vs. Mac debate who feel the same way, the fact is people are switching, mainly from PCs to Macs.
Walt Mossberg has posted a brief list of tips for people making that switch. His list covers the main differences between the Mac user interface and Windows.
To revisit the Tareyton theme as it really applies in context, would you rather continue to struggle with something familiar or spend a little time becoming familiar with something different that requires far less struggle in the long run?