Electric Power Research Institute throws in the towel on p.e.m. technology yesterday.
"Residential Power Technologies Still Need Work"
"Two types of fuel cell systems were found to offer the most potential for residential scale applications. They are the proton exchange membrane (PEM) fuel cells, which are currently a target of venture capital investment area, and the less well-known solid oxide fuel cells."
http://biz.yahoo.com/bw/000224/ca_electri_1.html
EPRI endorsed solid oxide fuel cell systems last summer.