If you are still fuzzy on what GeoJSON, now is a great time to learn. For us non-programmers, it's a data encoding for geospatial data that more and more products and services are supporting. In fact, USGS offers a series of GeoJSON feeds of earthquake data. The current specification dates back to 2008 and includes some familiar names in the list of authors: Howard Butler (Hobu Inc.), Martin Daly (Cadcorp), Allan Doyle (MIT), Sean Gillies (UNC-Chapel Hill), Tim Schaub (OpenGeo), Christopher Schmidt (MetaCarta).
Last summer GitHub announced automagic visualization of GeoJSON, which I thought was a big deal. And, now any open data there can be used in a Google Map.
So, yes, GIS users, you need to know GeoJSON and what you can do with data in that encoding.
At right: USGS GeoJSON on a Google Map. Yeah, it still looks like "dots on a map" ...