I include the following flake from pageflakes.  The 21st Century collaborative is an excellent blog for teachers interested in using web 2.0 technology. Pageflakes which is  a  personalised RSS feed aggregator allowed me to easily copy the HTML code for the flake and drop  it into this blog
On the technicalities: The principle is the same as copying code from a youtube video and pasting this code into a blog, wiki or web page.  Note that within the HTML code I can also easily adjust the width and height of  the tag.  
On the subject matter: The flake includes the 5 most recent articles of the 21st Century blog. The most recent article is about a new research tool.  I have not read this article yet, but it sounds as though it could be very useful.
Many thanks to  Sheryl Nussbaum-Beach  the author of the 21st Century Collaborative for bringing to our attention many interesting developments in this web 2.0 era.