Smitten Kitchen just had a really good one. I wouldn't bother making the onions/peppers again but the spices on the chicken were great.

http://littlechefmc.blogspot.com/2010/06/que-sabor-grilled-baja-style-fish-tacos.html

The cooks illustrated fish tacos.

I like the penzeys taco seasoning, but I don't really have a recipe.

i've been using the same old one from the joy of cooking forever. wondering if there is something better out there.

am open to fish/beef/chicken/turkey/vegetarian. if its kid-friendly that's a bonus too (i.e., not too spicy).