Here is a shiur I gave yesterday to Midreshet Rachel (for Lag BaOmer) about the concept of Semicha (which is one of the reasons given for the celebrations of Lag BaOmer)
and here are the source sheets to go with it (in Hebrew only I'm afraid)
Download Source Sheets
I recorded it with a new app on my new Motorola Defy, so you will have to decide for yourselves about the quality. It was also given in the Har Nof forest, so there are all sorts of background noises (included one of my kids needing the toilet half way through).
The shiur discusses the historical background of Semicha, when it was given and to whom, the end of Semicha in the time of Theodosius (and the failed rebuilding of the Beit HaMidkash in the time of Julian). I also speak about Rav David HaReuveini, Rav Shlomo Molcho, Don Yosef Nassi, and the dreams of Mashiach following the expulsion from Spain. There is a discussion of the attempt to reinstate semicha, based on Rambam's system, by Rav Yaakov Bei Rav in Tzfas. And finally a brief mention of the current Sanhedrin, and their semicha which was given to Rav Moshe Halberstam zt"l.