good Miata forums ?

besides this one, I found

miata.net -- one of the best resources on the web
miataforum.com -- part of miata.net

I have a 97 MX-5 white with tan leather, special edition (speakers in seat headrests).

Yup miata.net is the best one out there, Im on it all the time!

I know a ton of Miata guys Auto-X, if you are one of them then have a look at www.sportcompactracing.com

There's also www.aus-cartalk.com for Australian MX5 (Miata) enthusiasts, but you don't need to be an Aussie :D

Edit : Got the address wrong (thanks for pointing it out Matty :))