One of the features I did like about my old Instinct was threaded messaging. With Sprint's service being very unpredictable in our area there are days when texts and calls seem to get lost, only to show up hours after they've been sent. When you're sitting on your porch and you get a text from a friend that says "What aisle are you in now?" it's nice to have it show up right under the text you sent them two hours earlier that reads "Cool! I'm in Walmart too!"
The Palm Pre takes threaded messaging a step further and pulls not only texts but Instant Messaging into the thread. My husband can text me something while he's out, then send an IM from his laptop in the office, then send me another text on his way home and they're all listed in chronological order, right there on my Pre.
And, like anything else on the Pre, any conversation can easily be deleted by flicking it off the right of the screen. I especially like this because I enjoy keeping my threads uncluttered. I clean out my messages daily, keeping only those conversations that contain important information I may need to view later on.