If you are looking at using Windows SharePoint Services (a.k.a. WSS that ships with Windows Server 2003), check out these 30 ready to use templates from Microsoft. They range from Expense Reimbursements to Marketing campaigns.
There is also the SharePoint team site at Gotdotnet, this has tons of information on Sharepoint, FAQs and more. If you are administrator then the official Administrative Site for SharePoint has valuable info on Capacity Planning, Upgrade Options, Deployment scenarios and the likes.