There are several places to find awesome astrononmy pictures of the day taken from powerful telescopes in outspace. The most popular site is the NASA APOD site. You can find a link to the RSS feed from NASA on the astronomy picture of the day rss page. Another great resource is the picture of the day from astronomy.com. If you are looking for a mobile app for your iPhone you can download the astronomy picture of the day app from iTunes. AppBrain has a picture of the day app for the Android market as well, you can find that here. These are a few of the most popular astronomy picture of the day sites, feel free to suggest others that you may find!
If you have an interst in astronomy pictures you should consider getting a get telescope to see your own amazining astronomy pictures.