Understanding SharePoint inter-farm communications: http://blogs.msdn.com/uksharepoint/archive/2009/01/05/sharepoint-ports-proxies-and-protocols-an-overview-of-farm-communications.aspx
The right and wrong ways to iterate through SharePoint List items: http://blog.dynatrace.com/2009/01/11/the-wrong-way-to-iterate-through-sharepoint-splist-items/
Emad's Blog 
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