Sienna Club seems to be gone, gone, gone. I at times took questions on my Sienna there but now that URL shows a generic thing.
Just Google “Sienna forum”
Yes, that is a Toyota message board, but it definitely is not the Sienna Club.
However, I did find a thread dated around 2/9/2009 which indicates the owner of Sienna Club either failed to renew, or perhaps sold it.
This message board did a lot of censoring of the discussion as far as names where one might go. I find that unacceptable, thus will probably not be signing up on Toyotanation.
Someone also said the new owner will sell memberships for around $30 a year. A lot of former members said adios.
Thanks for tip. At least I found a probable answer.