I am often asked about courses after COS 109 -- courses that go deeper into CS, other aspects of computing, other courses about technology and society. Here are some suggestions for Spring 2008 of courses that are vaguely related to the topics of 109. I don't have first-hand experience with most of these and some are comparatively new, but this might give you ideas, and I'm happy to talk more about them, or help connect you with better sources of information than Course Offerings.
COS 116, The Computational Universe (ST)
COS 126, General Computer Science (QR)
This is the basic intro course for CS majors, the certificate in applications of computing, the SEAS programming requirement, etc. If you liked the more technical end of 109 and found the programming more interesting than terrifying, 126 is a good bet; it's definitely the best way to take the next step if you think that CS or the certificate might be an option, or if you just want to try the next course.
FRS 104, What do your DNA and your iPod have in common? (QR)
FRS 120, Life on Mars -- Or Maybe Not (SA)
FRS 174 Fundamental Ideas of the Information Revolution: Insights into Technology, Language, and Biology (QR)
ELE 102, Hands-on Optical Engineering (ST)
ELE 386, Cyber Securty (STX)
WWS 586F/COS 598E, Information Technology and Public Policy