This video for Cideas, a service bureau that provides high-end 3D printing and finishing services, is a great overview of the most popular 3D printing technologies available in the commercial/industrial sector today.
They do a great job of showing you the steps involved in going from a 3D model to a finished product. It took 6 weeks to go from start to finish on this model of a 1927 Miller 91 race car.
While all the pieces were 3D printed, there's a lot more involved than just running a single print job and pulling the part out of the printer! It's also worth noting that FDM/FFF was used mostly on the mechanical parts where strength mattered, while SLA is used where part features mattered the most.
FDM is the method that most personal/desktop 3D printers (MakerBot, Up/Afinia) uses. SLA or a similar DLP-based method (Form1, B9Creator) makes up the much smaller remainder of the personal/desktop 3D printers. SLS and Polyjet technology is pretty still limited to high-end machines.
