I recently found a very good series of Seerah lectures by Imam Anwar al-Awlaki and I would recommend everyone to read it. The main source of it is Ibn Kathir. However, only authentic seerah sources have been taken by Imam Anwar al-Awlaki.
I have included links for the lectures later on. However, please note that in the low quality Makkan period, CD 16 is missing. The reason is that CD 16 was given on the website as a duplicate of CD 15 and CD 16 was given in CD 17. Actually, Makkan period has only 16 CDs so you can rename the CD 17 file to CD 16 and you’re done.
You can also get some information on the importance of studying Seerah at http://media.islambase.info/AnwarAwlaki/Seerah.mp3.
