I've been getting a lot of comment spam lately(comes with the territory I guess). Comment spam is typically done by a computer hitting every blog it can find and leaving a generic advertisement as a comment. Any time you see a "comment deleted" message in the comment window of a post, it is almost always my deletion of comment spam. To defeat this practice, I have enabled the "word verification" function in the comments section. It simply requires you to read a word and type that word in a box before it lets you post a comment. Humans can perform this simple exercise but computers cannot. I hope this doesn't inhibit your commenting on this blog--it only takes a second or two.
Sorry for this minor inconvenience, Ed