There are a few threads from the past that will be valuable to keris collectors:
Here are two of them; What constitutes a good keris 1 & 2 ; the discussion gets a bit heated

but still there is much to be gleaned from these two threads on the old forum.
#1
http://www.vikingsword.com/ubb/Forum1/HTML/000307.html
#2
http://www.vikingsword.com/ubb/Forum1/HTML/000402.html
#3 Meteoric Iron
http://www.vikingsword.com/ubb/Forum1/HTML/001122.html
#4 Repatinating Keris Blades
http://www.vikingsword.com/ubb/Forum1/HTML/000717.html
#5 Regional variations in Bugis style wrongkos (picture rich)
http://www.vikingsword.com/vb/showth...+keris+comment
Origin of the Jawa Demam hilt form
http://www.vikingsword.com/vb/showth...3&page=1&pp=30
Mendhak Jogja and Solo
http://www.vikingsword.com/vb/showthread.php?t=5587
Need example of Pamors: Meteor, Luwu, and modern Nickel
http://www.vikingsword.com/vb/showthread.php?t=12057
Origin of Greneng
http://www.vikingsword.com/vb/showth...9&page=1&pp=30
Madura Wrongkos:
http://www.vikingsword.com/vb/showthread.php?t=3183
Suggestions for other classic threads are welcome for addition to this list.
Enjoy.