True abandonware is very rare nowadays (at least for PC games). Remember that I started this thread 2006. Home of the Underdogs was often the only place to get abandoned games and check them out.
Today we have GOG, Ebay and Steam has many old games, too - so there's rarely a need to use an abandonware site.
Home of The Underdogs is still a good site for reviews, mods and guides to get old games running.