More links are coming, but here are some good ones:
Shamrock ring bottle opener
Pinatas.com ( They have Irish pinatas...AWESOME)
We have a Cinco de Marcho Blog for more immediate updates on the development of the holiday and pictures!
Chrisitie Studio Productions: Official Sponsor of Cinco De Marcho!
Juan Carlos Villegas - Designer of the new logo (2010) Imagovera Studio
Ali Harper - Sympatico Amiga! http://flibbertygibbets.blogspot.com/