The "partner" piece mentioned by bmoc is either the Reader software from Adobe, or drivers from the CPU manufacturer (Marvell) for better power control (needed for a true "hibernate" mode, and for minor power bugs like spontaneous soft reboots on the PE - or am I the only one that has this problem on the PE?). The landscape suppport would come from Adobe.

Don't expect direct support for Word, PowerPoint in the Reader (if Adobe Reader on your desktop can't do it, the Reader on the eDGe likely won't). Mobipocket and lit are somewhat obscure formats at this point, and again, not supported by Adobe, so don't expect it on the eDGe eInk. Note for all these, you have apps that will handle these documents on the LCD side, and Calibre can be used to translite mobi and lit files EPUB/PDF.