My digital prints are printed with UltraChrom K3-ink by an Epson Stylus Pro 4800 since January 2007.
The materials I use for my prints are:
Epson Enhanced Matte Paper
Hahnemühle Photo Rag
Epson Water Resistant Matte Canvas
Canon Drop Paper
GoDirect Flag Textile Outdoor.
Info by Epson concerning the ink (in German):
Info about their material by Epson:
Epson informed lately that their materials (the above mentioned ones) printed with UltraChrome K3-Tinte and stored under glass will be prevented from fading between 75 and 108 years, if the prints are not exposed to the sun.