I leaned on that link heavily for the post because I found it to be one of the most fair and most thorough accounts of the life, trial, and execution of Servetus. I must admit, a lot of what I write about the Servetus incident comes from books, memory, and actively engaing in this argument innumerable times. But, here are few good links.
Wikipedia is suprisingly balanced in its
treatment.
Also see:
here,
here,
here,
here, and
here. These are all short articles, but pretty good. I know there is more stuff out there on the web, but I'm on a fairly new computer (my old one died) and I have to recompile some of the resources.