WotC produced and distributed promotional cards in various ways. Sometimes they were packed with other Star Wars items (Hasbro Unleashed and some Promotional cards). Most were given away to tournament winners (Promotional cards), and some were included in boosters along with an expansion's regular cards (Preview cards).
  In addition to simple card lists, I've included some other goodies for the Previews and Promos. There's a pictorial comparison between the 'standard' version of a card and the promotional versions. The recognition guides have thumbnail pics of all the cards in the group. The image ZIPs have pics of cards which WotC doesn't have on their site (or have really bad quality pics, even worse than some of these :-)).
  The IDC uses alternate versions of cards as combination previews/promos, and they are available on the IDC website, though I've consolidated them here.

NOTE: A few cards have had their name and/or version misprinted. In those cases the correct name/version is given, with the printed name/version in gray italics just below.