Yeah, it looks like they are gone for good. I also tried using the Internet archive (archive.org) and the weren't there either. I sent an e-mail to the professor, who already has replied and says he will look into the issue. Anyway, I will post back if the videos go back online.
However, as a substitute:
MIT OpenCourseWare | Electrical Engineering and Computer Science | 6.046J Introduction to Algorithms (SMA 5503), Fall 2005 | Lecture Notes
The videos and lecture notes at the above MIT link include some specific lectures on graph theory.
BTW, the video course below that Gablar mentioned for helping one understand computer architecture seems pretty good:
Quote:
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Originally Posted by Gablar
II. COMPUTER ORGANIZATION AND ARCHITECTURE — 15%
How Computers Work
Online course with 20 video lectures with problem sets and exams.
How Computers Work
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