This month's issue of the technet magazine features a great article by Pav Cherny covering the basics of the technical setup of Windows SharePoint Services 3.0 and how WSS, IIS and SQL all fit into the bigger picture.
One thing I'd like to add though is the use of Microsoft Search Server 2008 Express to enable cross site search features in WSS without forking out the money for a full MOSS installation. A great tool to add the power of enterprise level search to your WSS implementation
And what's even better... it's free!
I think that is worthy of a blog post in its own right. Watch this space. More info on SSE2008 coming soon!