At the TechNet's new site for Microsoft SharePoint Products and Technologies, you'll find technical resources, tools, and other information designed to help IT professionals deploy, maintain, and support SharePoint Products and Technologies.
As for non-Microsoft SharePoint resources (where there are tons of them), i will start with the WSS FAQ. Is it the ultimate FAQ for Windows Sharepoint Services. It is created originally by Mike Walsh but right now it is a collaborative contribution from the community.
I will be posting more resources related to SharePoint Products and Technologies.