LOPSA members save $45 when they register at to attend Usenix LISA, in San Jose, CA, November 7-12, 2010. I'm a member of LOPSA and I hope you join too. To find out about this discount you have to have to be a LOPSA member, and to become a LOPSA member you need to set up a free account first.
Step 1: Register for a free account on the LOPSA website: http://lopsa.org/user/register
Step 2: Become a LOPSA member: http://lopsa.org/joinup
Step 3: Paid members will see the discount code on http://lopsa.org/MemberDiscounts (Non-members see different text. Sneaky, eh?)