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
Enhanced Matte Posterboard
or Japanese Paper.
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.