In reply to Dnwsmith:
it's well worth buying a book, I think the accepted "Bible" is Nigel Shepherd's "A Complete Guide To Rope Techniques", ISBN 1841193232 . I have this book, it's well written with clear photographs of the knots and systems. Haven't put it to really good use yet due to not actually owning a rope! Although so far, I've only had to use the real basic anchors.