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Note that it doesn't stop there. If you follow geekmaster's knowledgable advise (I really like the hacking spirit in these forums!), you'd have a keyboard connected to your kindle and both devices would be able to communicate. I guess the keyboard will just ignore all the stuff the kindle sends to its serial port, but that is probably not for granted, though. Then you would need software on the kindle which allows you to grab input from the serial port and do its output to the e-ink screen.
All this comes across being very natural to an average "hacker" type of guy, who's just custom with taking her/his soldering iron and programming a few controllers (I think I'm almost there, I still don't like soldering, though, but I've learned a bit and I can help myself). "It's not so hard but it's not so easy" is basically right, but by no means it is an easily approachable goal to the casual end-user type of guy. Some hackerish software mangling is involved, too.
That all said, I think geekmaster gave a very good answer. The serial port is most probably your best bet and the lowest hanging fruit around for this problem.
I have another suggestion, too: you could use some USB host device - like e.g. a broadband router featuring an USB port - and use this to plug both a USB keyboard and the Kindle into it and use it to forward USB keyboard input to the Kindle via USB networking (on the Kindle). That would be more for people like me that hate to get their hands dirty on hardware and tend to be happy with software hacking alone :-)
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