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/']
Few from my side, mostly out of ESRI world:

* [CARTODB](http://blog.cartodb.com/)
* [MapBox](http://developmentseed.org/blog/mapbox/)
* [OPENGEO](http://blog.opengeo.org/)
* [Linfiniti Geo Blog](http://linfiniti.com/)
* [Smathermather's Weblog](http://smathermather.wordpress.com/)
* [GISTUTOR](http://www.gistutor.com/)
* [Open Source Computing and GIS in the UK](http://www.archaeogeek.com/)
* [Google Geo Developers](http://googlegeodevelopers.blogspot.ch/)
A few more GIS developer blogs:

<http://www.spatiallyadjusted.com/>

<http://wiki.gis.com/wiki/index.php/List_of_GIS-related_Blogs>