The NY Times ran an article about the permanence of inkjet prints. Mr. Henry Wilhelm and his research was the focus of the article. http://www.nytimes.com/2007/06/05/te...prod=permalink
Mr Wilhelm also has an interesting website that contains information about the permanence and care of photos. Included on the website are permanence ratings of inkjet printers, inks and paper.
According to Wilhelm Imaging Research --- my Epson R800 using UltraChrome Hi-Gloss inks will produce a print (on glossy paper and framed under glass) that should last 104 years. A print not framed will last 34 years. http://wilhelm-research.com/