GBL, the chemical that was just recently cheerfully marketed as
a legal GHB alternative, is now getting increased "attention" of FDA.
See story at
http://www.cnn.com/HEALTH/9901/29/fda.supplement.reut/
See more decent info at
http://www.frsa.com/ghb.html
http://uts.cc.utexas.edu/~laborit/contents.html
GBL under the name of PRO-G is still available from http://www.pelchatlabs.com/ together with GHB kits.