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Other improvements announced: Full screen reading view, color modes, and brightness controls. Again, all features originally introduced with the Kindle for iPad App. I'll admit, the full screen view won't be one I'd be tempted to use on most wide-screen monitors and notebooks these days, but it might work well on a netbook that has the ability to rotate it's display ninety degrees (since Kindle for PC doesn't have this ability, although the iPad does, I suspect due to possible lack of support from the graphics card in most PC's), as that screen would be small enough to comfortably hold and read that way (a 17" widescreen is just to long a line of text for me to be comfortable reading). Still, for some books, I can see that it might allow viewing tables and pictures in a much better size.
Now, all we need is the ability to use the dictionary and perform cross-book searches. Although, I no longer use either function on my original Kindle, as they both became too slow once I had more than a few dozen books; with well over a thousand, either can take 10-15 minutes (or more) to return any answer at all. Adding the ability to print would also be welcome, with, at the least, a 'current view' or 'highlighted text' option, even if it were limited to a small percentage of the book (so you can work off a recipe in the kitchen without worrying about splattering grease or flour on your computer or Kindle). There are, of course, workarounds using screenshots that allow you to get around this restriction, but they are not ones that every computer user might be aware of or feel confident in performing.
If you need help in using the new features, be sure to check the Using Highlights and Notes