I have learned never sell short on high tech companies from real live examples. My classmate received some stock options from his professor for summer work which turned to be GENETECH. Another friend joined NETSCAPE and become $$$ after one year work. 90% chance you will make lots of $ when you short, but the other 10% will clean you out. Price of high tech stock does not go up 10 or 20%, but 10 or 20X. Good Luck!