you use the same sort of trade script you would use for TGP sites or any other sites.. some examples are:
http://www.arrowscripts.com/
http://www.ucj.com
There are free versions as well that will skim 1% of your traffic or so but you don't have to pay for it
You just make all your outgoing links use the trade script
Btw, to update your blogs, you should just use our RSS feeds... they will be added to your blog automatically every time we update
see this thread for details
http://www.gofuckyourself.com/showthread.php?t=578921
hope this helps