The MacDevCenter's Matthew Russell has penned a great post about moving your email, address book, and calendar from .Mac to Google's offerings. Why would you want to do this? Well, we have talked about .Mac on TUAW before and most of what we have said isn't too rosey. Google has many offerings that best .Mac and they are free compared to $99 a year.
As Matthew points out, you are putting a lot of trust into Google to keep these services free (you might recall that .Mac was free with the OS for awhile as well) but if you're looking for a .Mac alternative this article makes moving to Google easy.