Mark Anderson’s blog at http://ictevangelist.com is a superb place to find all sorts of teaching ideas, advice, stories from the classroom and support with edtech.
Best class blog
If I had a class blog, http://roydon21classes.blogspot.com by Sheli Blackburn and her class, would be how I would like it. It’s full of creative ideas and examples of interesting lessons.
Best twitter hashtag
I’m a dedicated follow of (no, not fashion – I’m a teacher!), but of #ukedchat. In my opinion it is the best CPD on the internet. It’s based at http://ukedchat.wikispaces.com.
Best teacher blog
Karen Bolotin’s Tumblr blog at http://kbkonnected.tumblr.com is a treasure trove of edtech resources. Browsing just for a few minutes will give you enough ideas for lessons for weeks.
Best free web tool
The free tools that has made biggest impact in my classroom this year has to be http://www.classdojo.com
Best open PD / unconference / webinar series
The phenomenon that is Teachmeet (at http://teachmeet.pbworks.com) is second to none for professional development.