I’ll update this list as I find useful links:

http://triviumacademy.blogspot.com/
http://www.notebookingpages.com/
http://www.squidoo.com/cmnaturestudy (Charlotte Mason nature studies)
http://www.squidoo.com/drawingwithchildrennature (contains lesson plans for Drawing with Children to do with nature studies)
http://www.redshift.com/~bonajo/dwclp.htm (Drawing with Children lesson plans)
http://homescool-ed.blogspot.com/2007/04/sonlight-books-arranged-by-well-trained.html (Sonlight books arranged by the Well-Trained Mind History Cycle)
http://www.homeschoolblogger.com/karenciavo/ (Tapestry of Grace ideas)

http://handbookofnaturestudy.blogspot.com/

http://www.homeschoolshare.com (lapbooking and unit study ideas)

http://www.handsofachild.com (lapbooks-occasional free one)

http://www.currclick.com/

http://www.christianpreschoolprintables.com/ChristianFileFolderGames.html

http://www.lapbooklessons.com/

http://www.redshift.com/~bonajo/chowsotw.htm (Corresponding chapters in CHOW and SOTW and Vos Child’s Story Bible)