This is very interesting, and I believe that you have most of the answers you are looking for in this little piece of text. I am confident that there is both research problems and research questions hidden in the text. I can see some possible questions.

Identity development through blogging – that is, development of identity as a researcher, the way I understand your text. As I see it, posting entries about research during the process, getting feedback, like comments, suggestions, and critique, is part of an interactive narrative.

Identity construction through blogging as part of professional development.

Narrative inquiries can be performed in two ways: the researcher can analyze already existent narratives, or he/she can analyze any text, looking for narrative traits. In this case, it would be the last option which is appropriate.

What are the stories about identity that are being told in the blogs, openly or between the lines, how do these stories develop, what problems regarding research identity, self confidence, uncertainties, professional knowledge and insight do the blogs reveal?

It could be ok to interview the bloggers who want to be part of this research project, or just read the blogs, or both. It would possibly feel ok for the blogger to be asked about taking part in the project, even if the project is just to read the blogposts. All text reveal a lot, you know, if you know how to look. Narrative research is great in this respect.

There is no problem in connecting critical theory to a narrative project. On the contrary, since the material on a blog tends to be quite personal, and narrative analysis will emphasize the personal traits, as a communicative experience, there will be a need for some sort of theory to lift the material into another sphere, connecting the research with more generalized themes, categories, or theories.

The fact that these experiences is done in a virtual world, and the person owning the blog is a virtual person, an avatar, could call for some theory to highlight this virtuality. Connectivism, by George Siemens, is one possibility. Google this, and you will be introduced to a new world.

For narrativity, I can recommend the book “Narrative Research on Learning. comparative and international perspectives. Edited by Sheila Trahar, Symposium Books, 2006/2009. You can find it here:
http://www.symposium-books.co.uk

This book offers a lot about different perspectives on narrative research- theory, comparativity, ethics, method etc. And as I know, you have already read Clandinin & Connelly.

The design could be narrative research in virtual space, based on reading of blogs (and possibly interviews), focusing on the construction of research identity through blog experience.

This just a suggestion. You are of course free to use it, or not use it. Ask questions if you want to.

Good luck!