Still a little new to all the possibilites that Visual Studio 2008 offers.  That being said, what are the technological drawbacks of implementing one solution over another.  For example, I read somehere that the postback on a Web form lasts up to about 20 minutes.  So, connecting it to a SQL datasource could extend beyond a session time constraint.  This is what I am lead to believe.  Would someone verify this for me, please?

Also, this poses the question in my mind, what other pitfalls do I need to be aware when choosing one technology over another.  MVC looks easy to implement.  But, what are the drawbacks, as opposed to using a Web form?  In which instance is one employed better than the other?   All ideas, experience and training in this regard is appreciated.