- How many programmers on this site work with GIS?
That's unanswerable, but I will guess "lots". You'll only get a sample of those that use the site based on the amount of time it's on the front page, and only a sample of them will read the question, and only a sample of them will answer it.
- What middleware do you work with? ESRI? Mapguide? Google?
I write my own custom mapping software. You'll see why below.
- What kind of projects do you work on? Are you focused on web work, making desktop applications or intranet projects?
Embedded GPS and telematics devices. I do both hardware and software engineering for a wide variety of applications, from consumer GPS devices to tiny tracking and telemetry units. Mostly internet connected. Sometimes the GIS data is on the device, sometimes it's on servers connected via wireless. Some web dev work for the telemetry and tracking - for instance, ultramarathon bicycle races would have a device on the bike (or the crew car following the bike) and sponsers can follow the action online, rather than driving the route as the race progresses.
- What kind of industries do you work in?
Consumer, industrial, sports, shipping, etc. There are a lot of location based industries, or industries with location based applications.