Kstall,
Since most vendor courses are rather expensive, (unless your company will pay) are VERY expensive!
I would suggest some College UNIX courses in programming and Operating System.
Also, I did some self study. If you are interested in HPUX, you can visit their websites or go and buy books published by them at your local bookstore.
Their website is very useful! Either itrc.hp.com which is the technical man pages and documentation website and Bulletin board as well or
www.hp.com/education
There is a very good book also HPUX Certified that will help you get a good knowledge of HPUX.