I've switched from Haloscan comments to Blogger comments. There weren't any comments for the last week or so, making this a good time to make the switch. The primary advantage to me is that I get an email (for free) when someone adds a comment using the Blogger system. I'm still using Haloscan for trackbacks, though I don't think we've ever had any.
Please let me know if you have any comments regarding the new commenting system. I'll switch back in a heartbeat if we decide we don't like the new format.