geneven, AFAIK you can get free content through a PC with the web browser from Gutenberg. Whatever I buy I plan on keeping a local backup on my PC using Calibre as by library pplication so Kindle or Nook doesn't matter in this case.
Does anyone use the free Wikipedia access? It sounds cool. This, the free dictionary available from any book and "maybe" the "read to me" function make me lean toward the Kindle - today at least. I am nearsighted and read while "watching" TV (drives my wife nuts!

) and the larger screens of both the Nook and Kindle appeal to me as I won't have to wear my reading glasses and then have to look over them or take them off to glance at TV.
The larger screen for PDF reading on the Kindle also appeals to me, I can see downloading a lot of technical stuff for later reading. It makes the DX my Kindle of choice. The higher price of the larger Kindle does NOT appeal to me.
The .epub support on Nook is nice. I rather like the epub format, the last format besides TXT files was PDB when I used to carry a Palm. I also like the lower Nook price, the touch navigation and most of all the expandable memory - so I can stop carrying my MP3 player and listen to tunes AND read at the same time.
Ahh, me thinkks I should try the Kindle and return it if it doesn't work for me.