"Best way" to share calendar and contacts

We have Exchange 2007 SP1 running on Windows 2003 server, most clients have
Outlook 2003, but we will be upgrading to Outlook 2007 shortly, most users
are running Vista.

I have been asked to setup several rooms with calendars so one or two
individuals can schedule those resources while other users can only read the
calendar. Also, we need a common shared contacts for all users to have access
to.

We understand that PF will be going away in the future, even though that is
years away, so we do NOT want to use Public Folders, but use the features in
Exchange 2007 and Outlook 2007.

With that said, what is the best (simple setup & maintaining) way to set
this up? Should I create resource mailboxes using ESM? What about the
Contacts? Should I use the features of Windows SharePoint Services 3.0?

Thanks for sharing your ideas, I'm really not sure what to do.
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Thanks in advance....