The biggest issue facing tablets (as an owner of multiple) is that a lot of the applications were developed for smaller screens on cell phones. I find Android to be the worst for this.

However for school, taking notes and portability between Word/PP/XLS etc I would suggest the Playbook, however not having a blackberry phone makes integration a bit of a hassle. I big downfall of the product.

Secondary to that, I find the IPAD to be the least useful for integration with school related word and other products.

Android is probably my second best suggestion, however a lot of the apps, as I said, simply arent developed and ready for 7-10''+ screens which is a big turn off.

Perhaps a netbook is more reasonable.

Goof luck with your studies.