You want them to start selling themselves on your product even before you show them the sales page.
Have a scrambled (maybe every character is upside down) web page (sales page) and a pop-up overlay asking them for the “password” to unscramble it. You give them a (big) hint to what the password is. The password itself should be short and easy and should, of course, sell you. A pop up could say:
– “We give you a scientific and easy guide to being thinner. To get the information, please answer the following question.”
– Hint: “Our weight-lose guide is?”
– Answer: either “scientific” or “easy.”
Even if you have a good password for your computer or an online service, it can still be compromised by physical (someone watches you) or technical (key logger) means.
Build a mechanism that allows you to specify two or more passwords for the same account (making sure all of them are good and hard to crack.) Each time you can use any of them except the last one you used. This way if you have been compromised the password thief will still not be able to log in. If you use 3 or more passwords, it will be even safer.