Reid Kotlas started a new blog a while back but I just noticed that (after no updates in my RSS for a while from his old blog). It’s called Luxemburgist (a bit of a mouthful – do you pronounce it as a German name with “-ist”? Looxem-burgh-ist?) and I’ve just read through a handful of posts and comments there. It’s pretty interesting, and immortal N.Pepperell makes a surprise appearance in the comments.
I have both Luxemburg’s The Accumulation of Capital and the later Ant-Critique, but I’ve never had enough time to actually read them more or less carefully. I would, however, if someone decided to organize some sort of discussion.