General First Tablet ....ever questions

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http://androidforums.com – Just ordered the Nexus 7. This will be my first tablet. I normally carry my phone and a netbook and use PDANET to tether to the netbook. Questions... What are the must have apps? ?? What should I use to open PDF and open and maybe edit Word and Excel? ?? Any one got a travel (either rollable or foldable) keyboard either USB or Bluetooth they just love? ?? What is the one thing you wish you had known about the Nexus 7 when you took it out of the box? ?? Thanks. (General)