TextWrangler (free text editor), Gimp and Inkscape (free graphics) or Photoshop Elements ($90), OpenOffice (free) or iWork (office like from Apple $90), or MS Office ($150) depending on what you know and who you communicate with, Firefox browser (free), Xcode for Mac or iPhone development (free), Skype (free), Tweetie, no virus scanner needed for now, and an external hard Disk so you can use TimeMachine for backups are what I have added in the first 2 months with my first intel mac.