The Texas Chapter of the Association of Family and Conciliation Courts (AFCC) has many good links and resources related to co-parenting and other related issues.
http://www.texasafcc.org/

Other links that you might find useful:

Dallas Association for Parent Education
http://www.dallasparents.org/

Dallas County Domestic Violence Resources
http://www.dallasdvresources.org/

The Dallas Volunteer Attorney Program
http://www.dallasbar.org/dvap/

Divorce Magazine
http://www.divorcemagazine.com/

National Fathers' Resource Center
http://www.fathers4kids.org/

The Parenting Center
http://www.theparentingcenter.org/

TexasLawHelp.org
http://www.texaslawhelp.org/

Tufts University Child & Family Web Guide
http://www.cfw.tufts.edu/

Court listings

Collin County
http://www.texasjudge.com/index.html

Dallas County
http://www.dallascourts.com/index.htm

Denton County
http://dentoncounty.com/dept/main.asp?Dept=32&Link=66

Tarrant County
http://www.tarrantcounty.com/tc_courts/cwp/browse.asp?A=13&BCOB=0&C=42104&tc_courtsNavDLTEST=|

Locating Other Courts:
http://168.39.176.29/OCA/DirectorySearch.aspx

Texas Judiciary Online
http://www.courts.state.tx.us/