At FOSS4G we gave two presentations. The videos from other presentations are FOSS4G 2014 album. I have to commend the organizers for gathering such a rich collection of videos. Most of the videos turned out very well and are also downloadable in MP4 in various resolutions. It really was a treat being able to watch all I missed. I think there are still some videos that will be uploaded soon. As mentioned lots of PostGIS/PostgreSQL talks (or at least people using PostGIS/PostgreSQL in GIS).