I second the "Enjoy it" comment. I, too, bought a refurb 8GB iPhone just a bit ago, and at first was worried they'd come out with a new one soon. But then I thought, "Whoa... this thing is the single BEST piece of equipment I've ever owned. I love it." And that's that. It's a great device. Enjoy it.
That being said, our iPhones will be "outdated" in just a few months. It WILL happen. Your Penryn Macbook Pro will be outdated later this year too (Montevina) and will probably sport a case redesign. It WILL happen. If not later this year, then early next year. It's bound to happen. It's technology. It will be updated. But as grown-ups, we suck it up and deal with it. If you can't, then go sell your old one (yes, someone will buy it) and buy a new one. If you can't buy a new one, enjoy your old one, realizing that it's the best device you've ever owned.
That's life. Don't let your heart be troubled. Enjoy it!!!!!!