I am using the following method for last three years
for isolation of DNA from human blood. The method is RAPID and
does not use costly reagents like proteinaseK.
`A rapid procedure for extracting genomic DNA from leukocytes'
by S.W.M. John etal., Nucleic Acid Research 1991 v19(2), p.408
If you let me know your address I can mail a copy to you.
Shirish Damle, Chemistry Dept., University of Pune,
PUNE, INDIA 411007