What are people using LANDSAT data for?

You could refer this 47 page report by USGS "The Users, Uses, and Value of Landsat and Other Moderate-Resolution Satellite Imagery in the United States—Executive Report"

This page gives a list of research works done using Landsat Data.

I am using Landsat 7 satellite images to estimate evapotranspiration from reeds to establish wetlands water balance. Pity that Landsat 7 has failed Scan Line Corrector but still it is useful. Here is the link to a short description of my PhD research about it.

http://www.facebook.com/pages/Wetland-Water-Balance/131266760220169

Cheers.

Before the Scan Line Corrector failed on Landsat 7, we were using Landsat imagery for delineating snow covered areas. Because we have a relatively short snow season and the added gamble of Landsats temporal resolution mixed with the lottery of good weather in winter we used to get two or three good images per year.

Since then we have used products derived from Landsat imagery such as vegetation classifications and direct image products for moderate resolution base map imagery.