If you want a cheap phone you can just bin at the end of your stay, Tesco sell a pay as you go for £15 - it used to come with £10 credit already on it, but I don't know if that still holds true. Tesco also just resell O2 airtime, so make of that what you will. Note that Tesco will also multiply credit at certain levels - if you put in £10, they'll triple it to £30, £15 gets you £45 and £20 gets you £60. 1GB is £7.50 - but make sure to request a Data Bundle.
Three really only shine on Contracts - don't know much about their tarrifs.
Orange, which along with T-Mobile forms Everything Everywhere, will give you what is effectively a contract level of access, provided you pay in at least £10 pcm, and what you get varies by the profile - I believe I'm on Dolphin, which means I get a buttload of texts, very little talktime and meagre data.
Not posting AC, because I'm big enough to own my words.
Well, that, or half the people in my village are in all sorts of shit.
Nooks mount as a mass storage device; You drag your files over, disconnect and go into the library - it'll check for new content and that's it, you're done.
Militarisation of space is bad for everybody.
Additionally, the NC is capable of operating in Host mode; In other words, you can connect any old webcam up.
You can also buy expansion blanks with the crenellations already in, but you've probably got a load laying about anyway....