Following up from my post a long time ago about the Nokia N900 not supporting MMS natively here, this post is to elaborate on the state of affairs now.
frals from talk.maemo.org has written an application called fMMS. You can see the announce thread here. As of the time of this writing, it currently resides in extras-devel, but it is a very solid application and seems to work very well with minimal issues/configuration. Though, if you do need help, you can follow the help page here.
That’s all for now.