- Download site for Adobe Acrobat Reader.
- MIT's Open Course Ware (OCW) homepage. Here, you can find a whole bunch of stuff related to over 500 courses - lecture notes, exams etc. Courses related to EE 100 that you may find useful include 6.071 and 6.002.
- Huge website devoted to concepts from electrical engineering. It is basically a free-online textbook for EE.