Tree of Life displays the taxonomy of all life, as given in Wikidata.
You can open any of the nodes, and click on them in order to see here the respective Wikipedia article.
This page is updated from time to time, and if you edit Wikidata it will not be reflected automatically. So it can be used a bit for cleaning up the data.
This version is based on the dump available on March 28 2013, i.e. the last edit considered is from March 26 midnight UTC.