There seems to be a problem today with Haloscan commenting; generally I find it quite reliable, however if this problem is prolonged I may have to look at other options. From what I can see my blog is not alone in being affected.
UPDATE: (Tuesday 3JUL07 17.45 BST) Haloscan now appears to be working after a fashion, sporadically, but it is still not fully back up to speed. Grrrr!!