rpm dependencies

[Mike Noble]

I a new to Fedora, have been using Mandrake for the last several years.  I am 
trying to find a tool that will install packages and solve the dependencies 
for you (ie. download/Install the packages that are needed as well).  I looked
at yum, but when adding a package, it tells me that the following
dependencies are
not satisfied.  It does not tell me what packages I need just that
these libs are not
installed.
Does Fedora have a tool which will solve and make adding packages easier, if
so, what is it?

Thanks,
Mike