LIST OF POSSIBLE PROVIDERS
--------------------------

* NASA Astronomy Picture of the Day (APOD) -----------  DONE
http://antwrp.gsfc.nasa.gov/apod/astropix.html
Each day can be reached via the URL http://antwrp.gsfc.nasa.gov/apod/apYYMMDD.html
where YY is the 2 digits year, MM is the 2 digits month and DD is the 2 digits day.

* Flickr Interestingness  ----------------------------  DONE
http://www.flickr.com/explore/interesting/
API http://www.flickr.com/services/api/flickr.interestingness.getList.html

* Botanical PoTD
http://www.ubcbotanicalgarden.org/potd/

* EPOD - Earth Science Picture of the Day  -----------  DONE
http://epod.usra.edu/
RSS feed http://interglacial.com/rss/epod.rss

* OSEI (Operational Significant Event Imagery) 
Image Of the Day -------------------------------------  DONE
http://www.osei.noaa.gov/OSEIiod.html

* WCPoTD Wikimedia Commons Picture of The Day ---------- almost DONE (need to add the Credits URL below the pic)
http://tools.wikimedia.de/~daniel/potd/potd.php
http://en.wikipedia.org/wiki/Wikipedia:Picture_of_the_day#Including_the_POTD_on_your_user_page
http://en.wikipedia.org/w/index.php?title=Template:POTD/2008-02-03&action=render

Feed for Commons Featured Pictures
http://tools.wikimedia.de/~magnus/catfood.php?category=Featured_pictures

* http://interfacelift.com/wallpaper/
RSS feed: http://feeds.feedburner.com/InterfaceliftNewestWallpaper

* HackADay.com
http://www.hackaday.com/
RSS: http://www.hackaday.com/rss.xml

* Radiology Picture of the Day
http://www.radpod.org/

* Taiwan Picture of the Day
http://fotozon.com/daily/taiwan/

* Space.com Image of the day
http://www.space.com/imageoftheday/

* Animal of the Day
http://www.thewebsiteofeverything.com/weblog/
http://archive.dailypicture.net/animal_picture_of_the_day__daily_animal_photograph.htm

* A list of PoTD:
http://www.w3streams.com/