Hi,
Please go through the following links you will get full idea about the plugins,
ttp://mscrmtools.blogspot.in/2011/01/crm-2011-plugins-welcome-to.html //plugin stages
http://madhumuthuswamy.blogspot.in/2011/05/understanding-plug-in-ms-crm-2011.html
http://mscrmshop.blogspot.in/2012/01/step-by-step-plugin-tutorial-using.html
http://msdn.microsoft.com/en-us/library/gg327941 // stages of plugin
http://inogic.blogspot.in/2011/11/crm-2011-developer-toolkit.html
http://sliong.wordpress.com/2012/06/06/crm-2011-event-execution-pipeline-and-target-input-parameters/
http://mscrmshop.blogspot.in/2010/10/crm-2011-plugin-tutorial.html
http://msdn.microsoft.com/en-us/library/hh547400.aspx
http://msdn.microsoft.com/en-us/library/gg327941.aspx
http://crmconsultancy.wordpress.com/2010/10/25/plugins-in-crm-2011/ // developing & registering a plugin
http://crmconsultancy.wordpress.com/2011/06/06/using-linq-in-crm-2011-plugins/ //plugin using linq queries
http://andreaswijayablog.blogspot.in/2011/02/crm-plugin-parent-and-child-pipeline.html // parent & child pipeline
http://thomasthankachan.com/2011/08/12/pass-data-between-plug-ins-using-sharedvariables/
http://mscrmkb.blogspot.in/2010/11/develop-your-first-plugin-in-crm-2011.html
http://erikpool.blogspot.in/2011/02/crm-2011-plug-in-tips-and-tricks-part-1.html
http://community.dynamics.com/product/crm/crmtechnical/b/mscrmshop/archive/2012/03/22/step-by-step-plugin-tutorial-using-developer-s-toolkit-part-1.aspx //using developer tool kit
http://srmscrm.wordpress.com/2012/05/18/sample-crm-2011-plugin-to-add-note-to-contact/
http://nzcrmguy.blogspot.in/2011/03/updating-fields-on-crm-2011-plugin.html
http://crmdm.blogspot.in/2011/03/plugin-deployment-in-crm-2011-best.html
http://community.dynamics.com/product/crm/crmtechnical/b/crminogic/archive/2010/07/26/pre-image-38-post-image-explained-33.aspx // preimage & post image
http://crmtidbits.com/2012/04/24/crm-2011-images-and-parameters/
http://deepakexploring.wordpress.com/2011/02/04/preentityimages-and-postentityimages-in-crm-5-0-2011/ // preimage & post image
http://varghesedanny.com/2012/08/20/crm-2011-context-depth-issue/
http://blog.dorrekens.com/index.php/list/137-mscrm-infinite-loop-for-plugins
http://crmbusiness.wordpress.com/2012/06/18/crm-2011-debugging-plugins-using-the-plugin-registration-tool/
http://inogic.blogspot.co.uk/2012/06/how-to-debug-plugins-using-profiler.html // Debuggin a plugin
https://community.dynamics.com/product/crm/crmtechnical/b/crmbusiness/archive/2012/06/18/crm-2011-debugging-plugins-using-the-plugin-registration-tool.aspx
http://inogic.blogspot.co.uk/2012/06/how-to-debug-plugins-using-profiler.html
http://weblogs.asp.net/pabloperalta/archive/2010/12/01/how-to-remote-debug-dynamics-crm-plugins-and-workflow-assemblies.aspx // remote debugging
http://sliong.wordpress.com/2011/03/29/remote-debugging-crm-2011-plugin/
http://guruprasadcrm.blogspot.in/2011/11/how-to-debug-crm-2011-online-plugin.html // debugging a plugin
http://mscrm-developer.blogspot.in/2010/06/debugging-plug-in.html
http://blog.customereffective.com/blog/2010/11/top-10-crm-2011-customization-tutorials.html
http://crmvoyager.net/2011/01/14/deploying-referenced-assemblies-in-crm-2011-plugins-and-workflows/
http://www.mscrmconsultant.com/2012/01/crm-2011-solution-package-using-visual.html
Thanks & Regards, MS CRM Consultant, V.Surya. My Blog: http://inventcrm.wordpress.com/