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Easily the most versatile device you can buy is an iPod touch. Alternatively something like an Archos 5 is larger, but the software support on the iPod is dramatically better. Archos can surf over wifi, supports most modern audio and video formats (not mkv or ogm, some video codecs you need to pay for), read pdf's, and if you're willing to accept more weight, comes in sizes up to 250 GB.
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