iWeb allows you to publish blogs to mobile.me pretty easily; however, it doesn’t give you the ability to do categories. I tried Thinamablog to see if I could get it to publish to mobile.me. It works. With that and Haloscan comments and categories are included with templates from Thingamablog.
The Haloscan comments work; however, the code I have didn’t do in-line comments. After searching their site a bit more I found some code for in-line comments. I just didn’t have time to update the templates to include the in-line comments.