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1. 7.5" x 4.8" x 0.335" for Kindle 3. Don't know about Astak.
2. Yes, cable transfer is fast. USB speeds. I believe the write speed for the internal memory is usually faster than for SD cards, for example.
3. Yes. For Collections to be enabled, you have to connect via wireless one time. You can do that from a hotspot at McDonalds, public library, etc. You can also buy the 3G enabled one, which can be handy, in addition to the wi-fi only version.
4. Not sure what you mean, exactly. You can put your own documents on the Kindle in .txt, .pdf, or .mobi format. There are conversion services available through either Amazon or via free software like Calibre and Mobipocket Creator, Publisher edition.
You can buy any DRM-free .mobi format books from places like Baen Books, Smashwords, download from mobileread.com (here, the great free library), etc., in addition to buying books from Amazon, which may or may not have DRM. I recently bought a bunch of backlist Aaron Elkins books from Amazon, and none of those had DRM. The new ones do.
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