I usually just use pen and paper (my workflow works best this way), I also like OmniGraffle, but here are some others to check out: http://www.aquafold.com/ ht

I usually just use pen and paper (my workflow works best this way), I also like OmniGraffle, but here are some others to check out: http://www.aquafold.com/ http://www.aquafold.com/ http://www.sqlpower.ca/page/architect http://www.sqlpower.ca/page/architect http://www.dbvis.com/products/dbvis/ http://www.dbvis.com/products/dbvis/ http://www.thekompany.com/products/dataarchitect http://www.thekompany.com/products/dataarchitect ERD Stencil (Rails) for Omnigraffle: http://graffletopia.com/stencils/318 http://graffletopia.com/stencils/318