I've just started using Qumana to post on my blog. It is a nice little software that allows you to post to most kinds of blogs. It also supports automatic pings to technorati as well as tagging, categories and trackbacks. And its of course absolutely free (else, I wouldn't be using it :P)
It also comes with a built in feature to put up ads on your blog. These are not Google ads. They are QAds - Qumana's own advertising solution.
I was using Performancing for Firefox earlier. But I had some problems with it like missing posts, etc. I still have that installed, but I'm just giving this a shot and it seems to be pretty good.
Download Qumana here.
Screenshot (Click to enlarge):