On a regular to semi-regular basis:

http://programmers.stackexchange.com

http://programming.reddit.com

http://semanticweb.reddit.com

http://machinelearning.reddit.com

http://android.reddit.com

http://arduino.reddit.com

http://stats.stackexchange.com

http://semanticoverflow.com

http://www.metaoptimize.com/qa

http://electronics.stackexchange.com

http://arduino.cc/forum

http://www.cnnfn.com

http://groovyblogs.org/

http://www.planetscala.com/

http://answers.onstartups.com/

http://www.dzone.com/links/index.html

http://www.quora.com

http://www.phins.com/phins-urls.html

http://www.gallifreybase.com