I have 2 blogs, my main (friends and family oriented) one, and another that I use just for interesting or funny cell phone pics I take with my curve. I use Blogger for that one, can send posts to it direct by email. You can also send it posts by MMS, I just like the email better because the pics come out better. I think they MMS pics get compressed somewhere along the way. www.blogger.com
If you have a google ID you can sign in and set it up with that.
It's not software, but it does what I want.