Just ordered the base 13 inch macbook pro and I'm wondering what applications or software you have found very helpful and useful.
Also, what tips and tricks are good to know because this will be my first mac. (I have used them a bit so I'm not totally helpless )
Also have a look at the following links, as the information presented there might be helpful in your future endeavours into Mac OS X and could clear up initial confusion and may even prevent harm to your system or your files.
Mac OS X Basics
Switch 101 - guide with articles made by Apple on how to accustom yourself, after you switched to Mac OS X from Windows
AIM/Yahoo/MSN/Google (Almost all IM programs) http://adium.im/ Free IM open source program. There is a beta version of http://www.trillian.im/ for mac at this moment havent tried it yet