Are there any ways to update SMS software, or new apps? The SMS and MMS display is really annoying. I wish there was a way to have SMS/MMS look more like BBM or iChat or something.
There's a app called 3jam that will do your SMS exactly the way you are mentioning, Threaded IM messages.
There is a free trial version available, which I am using right now, and is working great for me. Check out the crackberry store for 3Jam. You should be able to find it.