I had been using my iPhone for my book reader using Stanza and eReader (from B&N) - I have the apps from Amazon, Borders, and Apple installed, but hadn't bought any books from them. Now I'm using my tc1100 for reading, and loving the larger space... on there, I use eReader (from B&N) and the FictionWise reader, though I have Calibre and Stanza loaded. I can also read PDFs easier now. I'm still thinking about getting a WiFi nook, but I'm not sure about that.
I advise everyone who has an e-reader to back up the books on their computer and use a good computer catalog to keep track of what will eventually be a lot of books and stories.
-AndeT1
+1. I'm thinking about doing a NANY entry for cataloging all sorts of electronic reading material- it's been something I've needed for a while. There are so many ways to read things that it's hard to keep track of them.