NewSpace companies like SpaceX and Blue Origin are developing lower cost ways to get to space . Companies like Planetary Resources and Moon Express are pursuing utilization of resources in space such as those on asteroids and the lunar surface. Developing an in-space infrastructure to connect and support such activities is the focus of the Future In-Space Operations (FISO) study group. They have regular teleconference gatherings of experts to which is given a presentation about some in-space technology or project. The presentation files are available in the FISO Working Group Presentations Archive.
Here are the slides (pdf) and audio (mp3) for the most recent talk, Technology Area Roadmap for In-Space Propulsion Technologies, by Les Johnson , NASA MSFC – July 25, 2012.