SPQuery & CAML

 http://shaiju-sp.blogspot.com/

http://aravindrises.blogspot.com/

http://blogs.msdn.com/pranab/archive/2008/02/14/how-to-set-item-level-permission-for-sharepoint-2007-moss-wss-list-document-library-programmatically-part-2.aspx

http://www.developerfusion.com/community/blog-entry/8389447/how-we-did-it-automating-service-requests-using-infopath-forms-services/

http://www.windows-tech.info/6/5a56eccf1e58a850.php

http://social.msdn.microsoft.com/Forums/en-US/sharepointdevelopment/thread/076c57b1-a780-4b86-b00b-849fa8789318/

http://social.msdn.microsoft.com/Forums/en-US/sharepointdevelopment/thread/597f48ed-6824-4bca-bca4-870e45bc59b4/

http://www.codeplex.com/SPCamlViewer

http://www.dailycode.net/blog/post/SPQuery-One-or-more-field-types-are-not-installed-properly.-Go-to-the-list-settings-page-to-delete-these-fields.aspx

http://www.stum.de/2008/02/06/querying-the-person-or-group-field-using-spquery/

http://social.msdn.microsoft.com/Forums/en-US/sharepointdevelopment/thread/4c37919f-f4e3-4e42-95d4-a810bdc6a71a/

http://www.beyondweblogs.com/post/SharePoint-Using-Queries-for-List-Data-with-CAML-in-WSS-30.aspx

http://www.zimmergren.net/archive/2008/05/05/how-to-easily-construct-your-caml-queries-with-spquery.aspx

http://aidangarnish.net/blog/post/2007/11/Using-SPQuery-and-CAML-to-filter-and-order.aspx

http://it.toolbox.com/blogs/sharepoint-blog/using-and-in-spquery-16956

http://www.sharepointblogs.com/ssa/archive/2007/06/15/using-quot-and-quot-in-spquery.aspx