Also I have another question: I have noticed that the font often seems blurry. If I look closely I can see blurry, jagged edges around the letters. Is this supposed to be so? Are there any ways of helping this? On some youtube videos the text seems way, way crisper.
There's an explanation of how the e-ink screen works here
http://www.kindleboards.com/index.php/topic,73465.msg1181739.html#msg1181739 - follow the link to read the techie bit.

On the newest Kindles (K4 and Touch), Amazon have changed the firmware so that it doesn't do a complete refresh on every screen change, it only does one every 5 screens or so.
The result is a faster page change (NEW! FASTER!!!!

) but the trade off is a loss in quality.
On the keyboard Kindles you could force a full refresh by pressing Alt-G. This doesn't appear to be an option with the Touch.
You can set the touch to do a refresh every page change with Home-Menu-Settings-Reading Options-Page Refresh ON.
Doing a bit of searching, there are a number of discussion threads around about screen problems with the Touch. Possibly there are some quality control problems with them, and possibly the additional layers on the screen to give the touch capability have affected the quality slightly.
If you're not happy, get a replacement: I read one thread where somebody had had 5 replacements! (
http://www.amazon.com/forum/kindle?_encoding=UTF8&cdForum=Fx1D7SY3BVSESG&cdThread=Tx1GW0OJQII2EJG).
Having said that, my personal feeling about this? Virtually all new Kindle owners initially think the screen is fantastic, but then go through a period of feeling a little disappointed about it; it's darker than real paper, it flickers when it refreshes, the refreshes slow down (so the flicker becomes more obvious) when it's hot or cold, there is ghosting on the screen and so on.
Within a few days we all start to realise that it is normal, and that the advantages of the Kindle far outweigh the screen problems; then we ignore it and we're happy from then on.
HTH,
Morf