I just got my kindle and trying to work it out.
1.Firstly, how to delete all collections?
More questions to come

Probably
2. New questions. What does dithering, pan to next page does? I am looking at pictures now and trying to figure out what they do. I also see that you cannot zoom in for pictures. That's a shame.
I enable/disable both these options and see no changes...
I couldn't even find a word dithering in users guide which is strange.
3. It also seems to be possible to view pics which don't fit in the screen, you see the bottom by using the 5 way controller. It kinda makes you think that zooming in a picture should work - you could use 5 way controller to see all the picture.
So if anyone reads comics on kindle, tell me how you optimize it.
4. Also is it possible and how to go to a specific page in home screen? I mean if I have 40 pages, can I go straight to page 24? Or do I really need to press next page 24 times?
5. Is it possible to make default settings for reading. For example for pdfs always landscape and darkest font?
6. Using search in home screen. When it gives results the ones with the word in the title are first. I use search to find a book. How to open it? Not the location - since it can be on page 31 in the book, but normally open a book? Even kindle user's guide opens this way on location 31 and not in the beginning or the last read page.
I am searching for a book, I find it and I want to open it and not some location. SOLVED. See comments below (#6 reply).