I frequently watch the GDC Vault: The Game Developer’s Conference video archive of conference panels. The Alone in the Dark postmortem, a presentation from last year’s GDC in San Francisco, is one of my favorites and covers the first PC adventure game I ever played. The presenter is fantastic, and it has a very good lesson and reminder about planning. The entire game was planned over a few days and the execution, which took many months, largely followed the overall plan and was very well done.
http://www.gdcvault.com/play/1015840/Classic-Game-Postmortem-Alone-in