When doing magical work it is often essential to be able to use the appropriate correspondences in order to add extra energy to whatever working we are doing. I found these sites particularly helpful.
Table of Magical Correspondences http://magickcorrespondences.blogspot.com/2009/09/big-elemental-correspondences-chart.html
Table of Planetary Correspondences http://fullmoon-magick.150m.com/planets.html
Table of Herbal Correspondences http://www.ladybridget.com/w/corrschart.html