Getting a Macbook

Hi, i am going into grade 12 and I want to buy the macbook in white(basic model) and I have some questions. The only reason I am allowed to buy a mac is because they can boot windows.( my rents hate macs and say they are not compatible with school)
1) can you use the isight for msn in windows xp(or what can you use the webcam for in windows what programs?
2) Is it easy to upgrade hard drive to 100 gb in 1 year or so?
3) Is 60gb enough for grade 12 and university?
4) Should I wait till leopard comes out, instead of upgrading to leopard and ilife 07 in 6 months or so?
5) How do you right click with only one button on the trackpad
6) what is the battery life using wirless internet?
7) what is iwork and what do you get with it?
8) can any applications from 10.2.8 run on tiger?
9) how come macs are alot more than pcs for what your getting? I saw a gateway 17inch, 240gb, 1gbram, 128 graphics for 200 more than an macbook.
10) can you use for example a scanner in windows using usb?
And last one: I have a program interwin dvd creater for my old laptop (windows xp) it came with it and I have no dics to instal it on my new xp mac? is there a way I can put this on?(i will do a fresh instal of windows professional and sell it!)