Another link to add could be the website of the young Belgian expedition that went to Fitz Roy early this year :
http://www.giftlist.be/patagonie/expedition.asp
I believe that Cerro Electrico is, in fact, a technical ascent. A non-technical route leads to a col on the summit ridge within 100-200 vertical meters of the summit. However, as far as I know, the actual summit cannot be attained without 1-2 pitches of relatively easy rock-climbing. That, at least, is what the caretakers at Piedra del Fraile informed me. Preliminary scouting suggested the same, although the 100kph winds and blowing snow at 2100m made it difficult to be sure. There may be a class 4 route hiding there somewhere.
Excellent page, by the way. I may add pages for Cerro Madsen and Loma de Pizarra, but I need to find some pictures first.