I notice that the Olympus E-510 has a crop factor of 2, should this be something I should be worried about? If I want to do landscape photography, should I be looking for a bigger sensor?

And the main differences I could see between the Canon EOS 400D and 450D is the megapixel, and bigger LCD with Live View, as well as the IS lens. Im not fussed about Live View, or the extra 2 MP, so its just the lens that appeals to me. Is shaky imagery something I should worry about?

Thanks
Zars