It really depends on what the rest of your curriculum looks like. If you're in a Computer Science program it is likely that you already have a required Algorithms course, usually with some sort of discrete math prerequisite. In that class you'll have the most important math concepts for computer science hammered into your brain. In that case, I'd take the vectors course because it covers math which, while very useful for a large number of fields, usually doesn't get covered in a CS curriculum.
If, on the other hand, you're in some other discipline and are looking to improve your programming skills either for work or for your own enlightenment, take the discrete course. It'll do a much better job at improving your programming skills, and will expose you to some very interesting parts of math that most primary- and secondary- school curricula ignore.

It looks like there's at least one usb port on it, so you might be able to plug in an average usb keyboard to work with it.

I hate dictation though. A dictation-only or even primarily-dictation-oriented interface makes it incredibly hard to do any sort of work in a public place, and in private you just sound stupid and/or crazy talking to yourself.

Given what I've seen Ubuntu do with a normal tablet PC, I'd almost rather buy just the hardware itself and screw whatever operating system they have pre-installed.

Timothy Zahn has some fascinating short series: his novel/series 'Cobra' is an interesting twist on a major cold war issue (super-soldiers as a stand-in for nuclear proliferation), while his Conqueror's Trilogy presents a fascinating look at cultural clashes in the guise of a first contact story. Also, Eric Flint's 163x series is a fascinating exploration of the technological, societal, and ideological changes which would come about were a modern-era town to be dropped into the middle seventeenth century Germany. Plus, at least a couple of books from that series can be read for free online/downloaded from the Baen library (http://baen.com/library).

Excellent.
Now I have the tools to acquire some Wonderflonium for my Freeze Ray