don't forget
http://www.direct-equity.net/forum/default.asp
Great BB with a few good spread traders. The guy that runs the site has been spread trading for quite a few years now and will bend over backwards to aid you in your spreading journey. He has posted on here before and probably goes under the name Wagnerz or possibly Andreas.
I am currently trialing the Tnt software and it appears pretty good. You can chart spreads and also show a seasonal indicator (only on single contracts though). It has functions that show you the point move between 2 points in dollars which I find very handy - better than manually calculating it. You can also export your data to a variety of formats. For instance, one could export all data to Metastock where you can then overlay say, each Nov Soybean contract for the last 10 years on the one chart maintaining the same scale - very interesting. Good software (no personal interest in it blah, blah ....)
dant.