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If you're getting an Android tablet for someone for Christmas, I've written a couple getting started posts (2011, 2010). The newer one has a bunch of suggestions from readers on what apps you might want to install.
Got a really cheap Android tablet, one which is so cheap that it doesn't have a decent app store? Then you might want to install Android Market using a set of simple instructions which have worked on many Android tablets running v2.3 Gingerbread to v4.0 ICS from many different brands (here).