With Mountain Lion said to be released later this month, it’s good idea to prepare oneself for the upgrade. At least, it’s best to get your system ready and to be aware of all the things that you should consider before you actually upgrade.
With that said, I am highly recommending the book, Take Control of Upgrading to Mountain Lion, by Joe Kissel. This is a book published by TidBids Publishing, and there are a lot of very useful and helpful books they have released over the years.
Although you can get it through their website
here,
I would also highly recommend the services to purchase any of the Take Control series of books from
these guys.
Please contact them for specific details.