I've just switched to a Samsung Galaxy Europa from a push-button Sony Ericsson K660, and already I'm finding a few features in the old device that I'm missing in the new one. For example, sometimes when I read a text message, I'd prefer to reply to it later. On the K660 I'd read the message, then return back to the inbox listing and mark the message as 'unread'. This adds the envelope icon back on the taskbar, and renders the message title in bold, so I know to respond to it later.
However some research on the web doesn't turn up much, and I wonder whether this isn't included in the stock messaging application. I'm running version 2.2. Any ideas?