Paul Stovell, a great guy I meet at CodeCampOz in Wagga Wagga, blogged about his circle of interest, and encouraged fellow bloggers to define their own.  Paul defines the three areas like this:

I decided to try to map out the things I care about at the moment, and this is how it turned out:

I would encourage any reader to create their own circle of interest, and in particular the following  bloggers:

• Gøran Hansen: Good friend and long time colleague. Into .NET, switched to Mac as his home computer, flirting with alternative languages like Boo.
  
• Martin Bekkelund: Active and highly visible Norwegian blogger with strong opinions on OOXML/ODF and Open Source. Just started in a new job at the Norwegian centre for free software.
  
• Anders Norås: Dual-minded developer with strong presence both  the Norwegian .NET and Java community. Blogs about agile, software design, DSL and more. Great read!
  
• Sondre Bjellås: Geek of the year, .NET enthusiast, Capgemini and Microsoft RD colleague and good friend. Bought the "love and sex with robots"-book when we where in Seattle for the MVP Summit, so his Circle of Interest should be interesting.
  
• Andrew Browne: Great guy I drove up to Wagga Wagga with a couple weeks back. Just curious about what he's into at the moment.
  
• Håvard Sørbø: Good friend from uni, into open source, C#, VOIP and everything with an Apple.