As far as Word mail merge is concerned, post cards are labels -
http://www.gmayor.com/mail_merge_labels_with_word_xp.htm or
http://www.gmayor.com/merge_labels_with_word_2007.htm
If you need to merge to both sides of the postcard, see
http://www.gmayor.com/duplex_merge_data.htm

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Graham Mayor - Word MVP
My web site www.gmayor.com
Word MVP web site http://word.mvps.org
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> Need to merger data sequentially onto 4 to a page poatcards