For you that I'd say start with Python. It's used for software development, scripting, system administration and web development which seems to hit everything you want. I'd check out udacity's cs 101 which teaches how to build a search engine in Python as well as Google's Python class: http://code.google.com/edu/languages/google-python-class/

Since you're still in school it might be worthwhile to see if you could sneak into an intro to programming class for your last semester.