Ok. So in MY case I am actually attending school for computer science and computer security and was able to join the ADC. I believe any college student can from what I have read from others on here.
You pay $99 for the package. You get a free t-shirt and a copy of the OS and a monthly mailing. Eventually, if things don't change leopard will come our way. Then you get a "once in a lifetime" discount. This discount is pretty significant. In the US it is about $101 difference from EDU prices once you factor in the intial $99 you pay to join. Also if you choose upgrades its also cheaper saving you more.
This is in reference to the MBP pricing.
word of advice since you are in college. DO NOT BUY THE WARRENTY FROM the ADC store.
You can buy items from any store you qualify for. So buy the MBP in the ADC store along with upgrades saving you at the very least $101, but more if you upgrade then you save another $100 for the warrenty at the EDU store....I know I am a loser and figured this all out.