Since we know very little of what the Kindle really does it is hard to speculate if there is even the ability to load non-Amazon content to the unit except through their dedicated email interface. If that is true then, like the iPod at the start, it is the world vs. the Kindle. If all of PG is off-limits except for those books forwarded as docs or pdfs in email then there is a bright future for all of the other readers.
If the Kindle sells then there is a good chance that more and more books will be available in other formats unless Amazon has an exclusive agreement for a lot of the content.
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