How do I install tar.gz packages in ubuntu?

Hi Everybody,I have just installed Ubuntu 8.04 because I heard from a friend about it.  Ive installed it and now I want to add applications.  Ive download some that I want but now I don't no how to install them.  They are in tar.gz format and I've looked all around the web and found no useful help.Please help me!

Compiling from tar.gz should

Compiling from tar.gz should be the LAST resort. Use a Package Manager such as Synaptic or Adept to download and install, simply, from repositories. See e.g. http://www.psychocats.net/ubuntu/installingsoftware or http://ubuntuguide.org/wiki/Ubuntu:Hardy#Installing_packages_.28programs...