I'm looking for recommendations for GIS blogs ... specifically GIS *developer* blogs. I'm less interested in the geography than in how apps are put together.

I'd like to keep up with ESRI ArcGIS as well as open source tools.

Which blogs are you fine people reading?
['https://gis.stackexchange.com/questions/32293', 'https://gis.stackexchange.com', 'https://gis.stackexchange.com/users/9795/']
and here are the new ones for Python 2.7:

<http://arcpy.wordpress.com/>

<http://docs.python.org/tutorial/>
This guy has some great stuff on the ESRI Javascript API. Not sure what kind of development you're doing, but if it's JS, this is a must read!

<http://odoe.net/blog/>