I do think Amazon will bring color e-Ink to the Kindle sometime in 2011 (there's already an announcement of a Chinese e-reader with color e-Ink from PVI due out in March), but I don't think that will make the Kindle 4 a multi-function tablet. First, I think Amazon wants to keep the focus on reading, since a lot of people like a device purely optimized for reading (as you say, the Kindle may only do one thing, but it does that thing very well). Second, even color e-Ink still lacks full-motion video ability, and the colors aren't as vibrant as LCD, so it's still not ideal for a tablet computer. Color e-Ink (at least the version we'd see in 2011) would still be best in dedicated e-readers, it would keep the benefits of e-Ink and add color book covers and illustrations -- but not movie playing, great Internet browsing, games, etc. Of course, Amazon could decide to make a tablet competitor, like B&N did with the Nook Color. But I think Amazon will always keep one branch of the Kindle line dedicated to those who read a lot and just want the best possible e-reader. And, honestly, for pure fiction reading, color would be nice, but isn't really THAT huge a deal to many people.