I don't have a Eee, but FBReader and a PDF reader (probably Adobe's acroread) are pre-installed. FBReader is a very good e-book reader, but only for DRM-free e-books. There is currently no e-book reader software for generic Linux machines that supports Digital Rights Management of any kind.
If it runs Windows or Linux, you can try out FBReader on your existing Desktop. It also runs experimentally on some OSX desktops.
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