>Can anyone recommend a good publication(s) or website(s) where I can get a good foundation in XSL? Our company is working with a large XML application (inherited, but works very well) that uses XSL's and I am having a great deal of difficulty finding consultants to help support changes and updates. I'm willing to learn but having zero background would love some pointers on good starting points.
>

Try this:

http://www.w3schools.com/default.asp