Calvin Institute of Christian Worship has suggested liturgies, texts, sermons ideas, hymns — you name it!
Textweek has its usual amazing assortment of preaching and worship helps.
Buildfaith.org has Thanksgiving Activities for Church and Families
Re:think Worship – Rethink Thanksgiving!
Ministry-to-Children has ideas for the kids.
WorshipIdeas has a nice roundup of resources.
Reformed Worship put together a list of blog posts on Thanksgiving services.
ShareFaith magazine has some tips.
Photo by AlicePopkorn, Creative Commons License