Best Practices to create SharePoint designer-Friendly controls: http://blogs.msdn.com/sharepointdesigner/archive/2008/10/03/best-practice-to-create-designer-friendly-server-controls.aspx These are best practices to follow when designing server controls to make sure they work well in SharePoint designer.
Understanding and Deploying Hotfixes, Public Updates, and Service Packs for SharePoint : http://www.microsoft.com/downloads/details.aspx?FamilyID=387cdef6-a807-4cf8-ae2c-16f0afccaf3c&DisplayLang=en
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