Working with CAML query in Sharepoint

Here is some links about CAML query in Sharepoint.
(1) Collaborative Application Markup Language (CAML)

(2) Writing CAML Queries For Retrieving List Items from a SharePoint List

(3) Query Schema

(4) Do you know to do data you need CAML?

(5) Sharepoint dynamic caml query problem?

(6) programmatically setting the CAML-query on the QueryOverride-member of an custom WebPart that inherits from ContentByQueryWebPart

(7) Write Your CAML Queries in C# using CAML.NET

(8) Update CAML Query for SharePoint Data View Web Part

(9) U2U CAML Query Builder for SharePoint 2003 and SharePoint 2007 (Windows Version)