You can do this with a special tilt-shift lens. That'll set you back $1,000 or more. You can also use photo-editing software, if you have the time.
Instead, try TiltShift Generator. It takes all the complication out of the process. The only thing this program does is the tilt-shift effect. Just upload your photos and play with the settings.
Experiment with it until you get the results you want. Making your photos look fake is pretty cool. But the effect can be used in other ways. Just have fun with it.
Look for the Installation heading on the Web page. And to see a professional example of tilt-shift photography, check out this video.
System: Windows XP, Vista, 7, Mac OS X