Thank you for mentioning Paul's Online Notes, this will be invaluable for me this summer term as I am signed up for calc 2 but have had 10years away from maths.
You can lock the display and the voice directions still subsist. The battery drain is from the constant polling of GPS information in my experience though.
I think it is smart to continue on and get a BA. Your abilities and experience can only help you further on in your career. Enjoy the time you have while you are young and physically able to enjoy it.
I have been running this on my toro (Verizon Galaxy Nexus) AOKP rom'd phone. Unscientifically this seems to make a difference to render speed of most everything.
I do as well. This past semester I switched to using Generals brand cedar point #333 2HB pencils and they are great quality I recommend trying them out.
I think they (canonical) have hinted at Ubuntu with touch support. This could be interesting for some of the touch laptop hardware that has been coming out with W8.
I caught the bug last year (2011) got a new bike in February this year and severely broke my leg in March (non cycling accident). Even with the bad leg I managed to lose a bunch of weight and feel great.