http://www.thru-hiker.com/workshop.asp?subcat=3&cid=4 - Instructions on how to build a tarp tent

http://members.tripod.com/halbertri/tarps.htm - general info on tarps

http://www.sixmoondesigns.com/products/Europa2.asp - another tent idea

http://www.ray-way.com/tarp%20book/index.shtml - I havn't checked this book out but his other book Beyond Backpacking has a section on homemade gear.

http://www.integraldesigns.com/tarps-frame.htm - you could just buy the sil shelter and call a day <img src="images/graemlins/smile.gif" alt="" />