Part of my business is to keep on top of the latest trends in Internet Marketing. I have literally looked at thousands of pitch pages. Some good, some bad but the bottom line is they always want your email.
In exchange for your email the marketer will offer you something free that has a high perceived value, Most likely some kind of digital download or ebook.

Here is a method to get the content without giving away your email. In my experience this works about 80% of the time.

While on the sales page:
FireFox: View > page source>
IE right click on the page and view source.

control “F” type in “form”

look for something that says “confirmation” or “return”

Copy the URL and past into a new window.

You now have access to the content and your email is safe.

The down side: If you end up wanting the content and or product they are selling, you are not on their list and will not be notified when the product becomes available. In this case just go back to the original page and optin.