Sky and Telescope Magazine--a magazine aimed at amateur astronomers
Astronomy Magazine--another magazine aimed at amateur astronomers
Space.com--website with recent developments in astronomy/space science
Astronomy Picture of the Day--cool site that displays a new astronomical image every day
JavaLab--Java-based astronomy applets. More fun than you can shake a stick at. They might be more useful later in the class.
Project CLEA--More interactive astronomy exercises. Windows only! :-(
Bad Astronomy--Bad (and good) astronomy in real life.
Explorations website--website for textbook
Introductory Astronomy Labs--from University of Washington
Galileo's Daughter--Dava Sobel. A biography of Galileo using letters from his daughter.
Coming of Age in the Milky Way--Timothy Ferris. A popular account of how our understanding of the size of the Universe evolved. The early parts cover some of the same material that was covered in class.
Longitude--Dava Sobel. This book is not about astronomy per se, but about how one of the greatest navigation challengers of 1700s was solved. Short and fun.
Red Mars--Kim Stanley Robinson. This book explores what it would be like to colonize Mars. Extraordinarily detailed and scientifically accurate. If you want to know what it would be like to visit Mars, this is the book to read!