http://compfight.com/ Excellent database for finding high quality, Creative-Commons licensed images. Don’t forget to source your pictures!
http://johnjohnston.info/flickrCC/index.php Another image search engine, but this one AUTOMATICALLY puts the source right onto the picture. Saves you time, and ensures that you aren’t ripping off someone’s picture.
http://www.iana.org/domains/root/db/ A list of all “top level domains”. In other words, this tells you what kind of site you are looking at, or where it comes from. For example, www.nuclearpower.de is hosted in Germany (“Deutschland”), while www.nuclearpower.jp is hosted in Japan.