If you're, ahem, "borrowing" Netflix from a relative/ex/neighbor/acquaintance, you may want to prepare for a change.
Netflix updated their FAQ section to include new rules that are intended to stop password sharing. These rules are expected to go into effect next month. Basically, Netflix will lock anyone using an account outside of the "primary location" out of that account until they sign up for their own account.
Might be time to dust off the DVDs?