Originally Posted by Xenophon
Go with the softroot, calibre, trook, and calibretoopds. You get navigation on the nook that's way better than anything Sony has yet provided. In fact, I switched from Sony to Nook just to get access to this combination -- my entire eLibrary, on my nook, with usable navigation (and series and book info, and coverflow, and...). You just don't get it through B&N's original software.
Have you tried the 650 yet? If you have not, I suggest you do so. It's a lot nicer then the 600 & 700 for navigation. And you do not have to hack it either.