This is an article posted on Active.com that really gives an excellent overview as to how one should choose a bike and what the benefits/detriments of full suspension vs. hardtail are. Rather than trying to explain the same thing over and over again to all of the newbies on the site, this would likely be a very good place to refer them as they begin their search. Once they've read through this, then and only then should they start asking questions as they attempt to refine their search for their perfect bike.
Click Here -- Great Article for All of You New Guys
Mods: I believe this would make a great sticky!