I switched to Mac last year in July. It took me a few weeks to become used to hitting the inner CMD key rather than the outer CTRL key for most commands, but even those few weeks weren't too bad. The one thing that slowed me down was that I had a Mac desktop compute and a Windows notebook computer, and it was awkward switching back and forth.
I prepare for my switch, I read a couple of Mac magazines. I forget which maybe Mac World and something else. They had buyers' guides, guides to switching, articles about tips, software, and hardware, and of course lots and lots of ads.
I never bothered to buy MS Office. I'm much happier leaving Word in my past. When I need a word processor, I use Pages, which is part of Apple's $79 iWork office suite. As far as I can tell, Pages isn't as full-featured as Word, but I honestly don't miss any Word features. Also, Numbers (the iWork spreadsheet) does whatever I need, and KeyNote (the iWork presentation app) handles most of my old PowerPoint slides, some of which were quite complex, with lots of animation.
Also, TextEdit, the built-in text editor works for both plain text and rich text, and will save in .doc, .docx, and .rtf formats.
For writing, I use a fantastic tool called
Scrivener. For a year before I switched, many of my friends annoyed the hell out of me by singing Scrivener's praises at every opportunity. That was annoying because they were obviously right (check the features and the tutorial video) and the goddammed thing didn't run on my Windows computer. And none of my friends--not
one, mind you--would buy me a Mac so that I could experience their Scrivener joy. Bastards all.
And no, I'm not saying I'll buy you a Mac so you can use Scrivener. I never claimed not to be a bastard myself.
My primary reason for switching was reliability. I just got tired of my Windows machines failing catastrophically. I don't think that was the fault of Windows per se (though I seriously do not miss Windows, either), but more a problem of incompatible and shoddy hardware manufactured by different companies.
There's a pretty good book called
Switching to the Mac: The Missing Manual (Leopard Edition) by David Pogue. You may prefer his other book,
Mac OS X Leopard: The Missing Manual, which is more about Mac OS X Leopard and less about switching. And there are a zillion other books about Leopard. (Note that the new version of Mac OS X, called Snow Leopard, will be shipped in September. I think you'll get a free upgrade.)
Dale