I've had my new macbook for about a month now and I LOVE it... you will too. Here's a list of what I think are some of the more important softwares you might want/need.
Software you've installed
AppZapper (great utility to make sure everything included with a program is uninstalled)
ADIUM (chat program that allows you to use ALL you different screennames, aim, yahoo, msn, etc)
JUNKMATCHER (spam filter for macmail)
BACKUP (you can get this if you purchase a .Mac account (which I recommend for it's syncing utility alone- although there's a lot more that .Mac has to offer)
PHOTOSHOP ELEMENTS (if you're going to be doing any photo editing)
MICROSOFT OFFICE FOR MAC
ONYX or DiskWarrior (maintenance utility)
foxmarks (allows you to save all your bookmarks and sync them from any pc/mac)
Toast (for ripping and burning)
Flip4mac (you'll need this to be able to watch windows media files)
Norton Anti-Virus for mac (although this is a debatable issue, having anti-virus software in my opinion is just good sense. We (right now) don't need it however, it doesn't mean something might come out OR more importantly to protect all the people you send emails and such to).
WeatherPop (great weather program)
TextExpander (This Program SAVES SO MUCH TIME)... it automatically inserts text with key words... for example, if I would type in adrx it would automatically insert my address...
Parallels (if you want to run some windows programs on your mac)...
Also, since you'll be at college, I would look into a tracking program for your mac (like LoJack) as well as a cable lock...
Have a great time at college! Hope this helped!