Why on earth would you want to get rid of QuickTime? Your web browsers wouldn't work anymore. QuickTime does all of your jpegs, gifs, pics, etc... You CAN'T get rid of QuickTime any more than you can get rid of Carbon, Cocoa, or Quartz. Yes, it can be done, but you wouldn't have OS X any more. QuickTime is not just an application.
To delete an application, drag it to the trash. This works on the vast majority of applications. On the rest, there may be a few extra files buried in /Library or ~/Library.
BTW, both of these questions are in the wrong forum. They are not in the least bit iBook specific. You would get more responses in the OS X forum.
As far as the other question, check macosxhints.com.