All in all, it looks like MOSS 2007 server farms consist of:
- Front End Web Servers – (low storage, hosting IIS, SharePoint and any custom web parts/custom site definitions/templates – this is a guess)
- Application Servers – (high storage, hosing IIS, SharePoint and indexes for search – again a guess)
- Database Server – (hosting the content and configuration databases)
Sounds like MOSS 2007 is in general way more flexible and configurable in Server Farms than SPS 2003 (with its three major themes of “supported configurations”).
Don’t miss all the planning you should be doing vis a vis Server Farm Architecture as you design your environments:
Planning worksheets for Office SharePoint Server 2007
Also, the configurations of the Shared Service Provider(s) give you a lot of flexibility.
Unfortunately, it looks like most of the Technet articles are still TBD (to be written), but I found one that was decent:
Determine hardware and software requirements (Office SharePoint Server)
Also, my Systems Engineer homie at my workplace sent me a lot of very interesting seeming audio-briefing links:
TechNet Events: Supporting Materials