I use Johnny's Seeds and Territorial Seeds as sources of information. They are seed vendors, but they both have lots of info.
If you go here, you can find a Cooperative Extension System Office for your county.
As you follow the link down to your county, you also find links to universities in your state with Ag departments that have outreach programs:
http://www.csrees.usda.gov/Ext...
These specialize in tomatoes:
Tomatoville
http://www.tomatoville.com/ind...
Tania's TomatoBase
http://t.tatianastomatobase.co...
