To find the location of this cache, you will need to learn a little about a complement to data encryption that can be used to facilitate the covert exchange of information - steganography - and some of the associated techniques used to conceal messages.
While modern digital steganography techniques commonly use software programs to encode secret messages into image or sound files (such as this listing's background image), the same program is usually required to extract that message. Since requiring the use of such programs runs contrary to current Cache Listing Guidelines, I have used another common technique to hide the cache coordinates on this page.
However, if you would like some additional pointers to try and decode the background image (updated on 5-15-2013) as an independent learning exercise, please send me a message. Good hunting!
Congratulations to beerslayer2000 for the FTF when this was a Difficulty 4 puzzle!