I would like to offer an SSL certificate for all of the domains on my server. I want to be able to offer something like secure.piermarketing.com but the security on their site will still be https://www.domain.com.

I want to set something up similar to media temple, if anyone has experience with them.

Thanks!

A shared ssl is really not a good idea.
The whole point of security is to match the cert with the domain handling the transactions.
So having secure.piermarketing.com show up on the certificate for a domain called mydomain.com is not exactly re-assuring for the client/visitor of that domain.

I'm really surprised that any host is still offering shared certificates, especially since costs of certs have come down