Good reference links on SharePoint

Starting.. 

Introduction to Share Point Architecture

http://www.wssdemo.com/Pages/Architecture.aspx
http://wiki.ittoolbox.com/index.php/Sharepoint_Interview_questions
http://sharepoint.microsoft.com/pedia/Pages/Home.aspx
http://www.sharepoint-tips.com/
http://wss.collutions.com/default.aspx
http://office.microsoft.com/en-us/sharepointdesigner/FX100487631033.aspx
http://office.microsoft.com/en-us/infopath/default.aspx

Windows sharepoint services 3.0 (wss)

http://technet.microsoft.com/en-us/windowsserver/sharepoint/default.aspx

WSS Demo
http://www.wssdemo.com/application/default.aspx

Sharepoint Developer
http://blogs.msdn.com/pandrew/archive/2008/06/11/MSSharePointDeveloper-Content.aspx

For Installation and Site package refer here.
http://stsadm.blogspot.com/2008/01/create-site-in-database.html

Sharepoint Pedia
http://sharepoint.microsoft.com/pedia/pages/home.aspx