The only thing I use it for, is to telnet into my Kindle 2 (US only wireless) to set the time (I'm outside the US and cannot have my clock set over whispernet). I don't have experience with anything else.
Do a search for usb networking and also read the whole thread about the 2.5 hacks.
Also read this Thread:http://www.mobileread.com/forums/showthread.php?t=49350
especially this post: http://www.mobileread.com/forums/sho...068#post617068
Some of the information in that thread is probably outdated and not true for the newest Kindle, so be careful.
I do think somebody with some more knowledge should write a wiki with all the information in one spot.
I'll email the file to you (why don't you download it from here???), but you better delete your address from your post.