I have some errands to run but I’ll check them out later. Thanks for the suggestion.
The instructions at posterous.com are nearly non-existant. I suppose that’s supposed to make them seem easy to use, but it also doesn’t answer any questions at all. And it looks like your blog would just be yourname.posterous.com which isn’t at all what I want.
Ya know, I always say that I’d rather be lucky than good, and today I was.
Somebody had expressed interest in what my top 10 for last year would have been; now you can find out at
http://poorimpulsecontrol.blog.com/
Many thanks to all who made suggestions. 
Y’all fucking rock!
If you buy your own domain name and hosting, you can install the Wordpress platform there and use it for your blog (download it from Wordpress.org) - it’s far more flexible when you do it this way, anyway. There are plenty of free WP themes, cheap WP themes, or you can create your own.
edit: Oh nevermind, I apparently hadn’t read the 2nd page yet. If you ever change your mind, I believe you can export/import your posts from blog.com to Wordpress.