The only preachers who claim Christ descended into hell after His death on the cross are those who have departed from the Truth. If "most preachers are saying" what Joel Osteen says, you are listening to a group of deceivers. That it's a popular lie doesn't make it true.
You can read more about Osteen and his ilk at these links:
http://christianunplugged.com/judgingabook.htm
http://www.ccwonline.org/osteen1.html
http://www.apprising.org/archives/2005/10/the_truth_turne.html
And you can read my view on similar topics here
http://brogdensmuse.menofhonorministry.org/Apologetics.htm
The bottom line - let the Word of God (not the words of man) richly dwell in your mind.
And he said unto them, why are ye troubled? and why do thoughts arise in your hearts? Behold my hands and my free, that it is myself: handle me and see; for a spirit hath not flesh and bones as ye see me have. (Lk.24:38-39)