Thanks for this Bex, it's always good to get references to this sort of material. I have had a research blog since Nov 2008 and see it as a way to strengthen 'the researcher as research instrument' that is me. I wrote a guest post on thethesiswhisper.wordpress.com blog a couple of months ago on social media and the phd and there are a few more references in that. See http://thethesiswhisperer.wordpress.com/2010/08/31/social-media-and-your-phd
Bex Hewett posted a link from this journal earlier on blog diaries. This is the home page. I've just got some useful information about using a case study from here (vol 3, issue 4). Useful journal! Thought it was worth posting again :-)