Unless you've converted your whole setup to high definition (HD), standard definition (SD) is probably for you.
SD stills are 720x540 (4:3) and HD stills are 1280x720 (16:9).
You don't have to decide when you buy — both SD & HD versions include all three formats.
MPEG-1 is, most likely, not the best format for you. It will, however, work on any presentation software but can be “clunky” on a Mac.
Windows Media (WMV) is a nice compression for PC users. It typically works much better than MPEG on Windows.
Quicktime (MOV) is the best option if you're using a Mac, or Pro Presenter or Media Shout on a PC.
Triple Wide formats are designed for Environmental Projection or custom LED large venue events. If you're not familiar with either of these, you probably don't need this format for your system. We offer Triple Wide in either SD (2400 x 600) or HD (3840 x 720) resolutions. Most Environmental systems are still projecting in SD resolution, but if you are doing EP in HD then we got you covered!