What is the best way to copy 1000 pics from my PC to my ipad3?
This TC Geeks article describes several ways to access files on your iPad, using FTP or Bluetooth.  You'll need an FTP server- or server-capable app on the PC side; there are many.  The article is old - check current prices.  The first iPad app described is currently (9/1/12) available at a hefty discount, f/ex.