I am subscribed to two software project feeds. One is of course IronPython, which I mainly use to monitor the issue tracker. I would prefer mail notification for this, but it's not implemented in CodePlex.
Another is PyPy. Quoting somebody on YouTube (hah!), "PyPy is the most ambitious project any language has ever had", and I believe it. Even if you don't believe it, it's well worth subscribing if you are into programming languages. By the way, the YouTube video is PyPy - Automatic Generation of VMs for Dynamic Languages.
Programming language developers
I am subscribed to blogs of developers implementing programming languages. For IronPython, I have Dino Viehland and Martin Maly on the list. For JRuby, Charles Nutter and Ola Bini are great.
Just like about everybody else, I read John Lam to follow IronRuby. From Mono developers, I only read Jb Evain. If signal-to-noise ratio for me were a bit higher, I would have read Miguel de Icaza -- but I don't.
For JVM, I read Gary Benson and John Rose, although both are usually over my head. Last two blogs in this category are from GCC developers (among other things): Ian Lance Taylor and Tom Tromey. Surprisingly, Ian and Tom are usually not over my head! I thank them for their generosity -- I am entirely sure that they are capable of writing posts inscrutable to me. :)
Being a science fiction fan, I read Charles Stross. There are many great science fiction writers, but that set somehow doesn't seem to intersect with the set of great bloggers a lot.
Being a fan of mathematics, I read Terence Tao. I don't pretend to understand technical materials there, but occasional posts directed to the "public" is simply great. For computer science fans (as opposed to software engineering!) I recommend Scott Aaronson. Be sure to check out his lecture notes!
I read Alp Toker for no particular reason. His posts always have been enjoyable to me. I temporarily have Antonio Cangiano on the roll, mainly not to miss his Ruby shootout.
That leaves me some Korean blogs. Hye-Shik Chang, a Python developer and a FreeBSD port maintainer, is the best Korean blogger in his niche. Park, Seong Chan is a theoretical physicist who writes great approachable posts on physics news. Kim Gyuhang is a progressive columnist. I sympathize with his political views. He is also my writing model for how to write clear and affecting Korean prose.