Machu Picchu Trek, a free blog/info clearinghouse on trekking to Machupicchu has added us to their blogroll of
recommended South American blogs, which I think is prettty cool.
As for their own site, it seems to have all the bases covered, from routes and packing lists to tips on getting trekking insurance (yeah, I guess it's a thing). I wish I'd have known about it when a friend of mine was about to hike the Inca Trail.