Image changes are saved 'automatically' in iPhoto. If you don't like something you've done, you MUST undo it, if you want to save changes, press 'Done.' It's neither intuitive nor satisfactory, I know - I've fallen foul of this unfortunate 'feature' a few times myself. I hope it gets fixed in future versions. Overall however, iPhoto is still a lovely app for basic image manupulation requirements.
Oddly enough
Falps, the 'Delete' key on iBooks (and Powerbooks too I think) is actually a backspace. To modify this to the 'forward delete' I think you're after, try 'Fn+Del'.
Here are some more OS X
keyboard shortcuts you may find useful
Jx
PS
Paparazzi is a great little free utility for making captures of web pages. It can capture any non-visible parts of a page in addition to that which you can see!
