There are very many helpful threads, which you will find here about .mac here on the boards. Below are the search results for .mac. Scroll down half way to get to the great input.
I will personally say get it, I don't have it but I am planning on getting it soon. You can post all of your stuff on the sites. You can use it to back up files, and share files with people you know. I would say get it. Its not expensive, think its only 99 for the whole year, thats less then 10 dollars a month.
Its a good deal if you use the student discount or go to the apple store and see if they will give you the $30 discount special. I got it for $70 two years in a row now. Amazon sells it too for a discount a lot of the time.
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