http://tectonicdesigns.com/contest/rss.php

You can filter the RSS feed through the following GET parameters.

• Fromdate - show items that has been made after or on the specified date. e.g, 3/21/2010, march-21-2010, UNIX-TIMESTAMP
  http://tectonicdesigns.com/contest/rss.php?fromdate=3/21/2010
• Category - The Category of the feed item. e.g, j,c,x,0,a
  http://tectonicdesigns.com/contest/rss.php?category=j
• Mode - The type of which the feed should be shown. Default is rss2. e.g, rss1, rss2, atom
  http://tectonicdesigns.com/contest/rss.php?mode=rss1