A chance link to my blog has led me through an ego search to find Will Thomas’ most excellent Ether Wave Propaganda blog. Will is a historian of science post-doc, I think, and he has an engaging style.
Coincidentally, John Lynch lists various links to history of science, including a number of bloggers (your host included). It looks like the beginnings of a Mexican wave of historians.
I recommend Will’s post linked to at the start of this post as a discussion of the role and justification for doing history of science.