http://www.builditsolar.com/
http://www.builditsolar.com/References/otherdiy.htm
A number of people seem to like this site:
http://www.instructables.com/id/How-...ger-aka-Might/
Of course there is wiki:
http://www.diyinfo.org/wiki/Free_DIY_Plans
In some circles the concept has been around for awhile now, like since the 1890's for
the rural comunity. The internet does really make for a big improvement though.
Luck;
Ken