"Elements of Astrophysics" is a nearly complete set of notes on my course on introductory astrophysical theory.
elements.pdf is a Portable Document Format version that is best to view on screen (using Adobe's free 'acrobat' reader - called 'acroread' on unix systems - and available here).
elements.ps is a postscript version that is best for printing but is more voluminous.
I have also prepared postscript files of individual chapters for your convenience.