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phranque - 10:26 am on Jan 24, 2010 (gmt 0)
welcome to WebmasterWorld [webmasterworld.com], tarunrajput!
one of the most common problems i see with dynamic sites is that they will serve content for non-canonical requests instead of responding with a 301 redirect to the canonical url.
duplicate id's are common as well as other invalid and bloated markup.