Fresh out out the box your new Mac will have the following software pre installed.
Mac OS X operating system currently Snow Leopard also known as MacOS 10.6. When you connect to the internet you will probably be offered some software updates to take this to currently 10.6.2.
Safari, internet browser.
Mail, e-mail application.
Address Book, contact information application.
iPhoto, photo storage and manipulation software, this will open when you connect your camera.
iMovie, video editing software, will download camcorder footage.
iWeb, simple web site building application.
Garageband, for music making and editing.
iTunes, say no more!!
Photo Booth, application that uses the built in web camera, it has some photo effects.
Time Machine, backup software.
iChat, social networking application.
Quicktime, video player.
iCal, calendar and diary software.
iDVD, DVD burning software that lets you create your own DVDs.
DVD Player, DVD player!!
Front Row, lets you access your music, films, movie trawlers via a different interface.
Preview, PDF viewer.
Boot Camp, allows Windows to be booted from the hard drive by partitioning the hard drive.
and Dictionary, Font Book, Image Capture, iSync, Dashboard and Stickies.