msdn, experts-exchange.com, codeplex, codeproject.com, stackoverflow.com, more...
I don't do that regularly. I usually end up in StackOverflow when I have unanswered questions.
Stackoverflow, reddit, slashdot
Oh huge list here.. but my top three are:
Hacker News - http://news.ycombinator.com
This site is how I stay on top of the coding world. The community is second to none, and the content is always, bar none, very interesting.
c2 Wiki - http://c2.com/cgi/wiki
Every programmer should have this site bookmarked and its contents frequently viewed.
Stack Overflow - http://stackoverflow.com
If you have a question on programming, it's either already been answered here, or will be answered if you ask.
php.net, w3schools.com, smashingmagazine.com, css-tricks.com, net.tutsplus.com
Hackernews and various blogs, feeds.
I subscribe to a few mailing lists, but mainly I google.
Mostly just stackoverflow.com
I like to help answer questions on the Adobe community forums.
stack overflow is a very useful resource, linuxforums for my Linux issues. The register because, well, you have to. Other than that I causally read a large number of tech sites and pay little attention to what they are called (techRadar I think is one, wired maybe (that might not be tech stuff)). I'm a big fan of ashlee vance, I've tried to follow him since his register days. I often catch stuff on Feeding edge, which is run by an ex-IBMer.
No regular habit.
Stack overflow, techmeme, Reddit
It use to be XNA-UK UG, but as we have had to close it, none now really.. :(
The StackExchange family of websites