[CentOS] why yum cannot find lighttpd?

> I tried to install lighttpd in CentOS 5.2, but yum list lighttpd
> returned an error of "no matching packages to list". Should it be
> installed from source tarball?

lighttpd is not in the CentOS repositories.  It is however a part of the 
rpmforge repositories.  Add the rpmforge repository and then you will find 
it.

Barry