lead generation plugin needed

Hi all,

I am setting up a site and I want on a few pages to have a lead generation plugin.

What it needs to do is that users need to enter their naam and email before downloading an ebook/file. Then they receive an email, they confirm their email and then they get the download link.

I am trying to setup a page like unbounce –> http://unbounce.com/landing-page-templates/#lead-generation

Also a plugin like pay with a tweet or like our facebook page before downloading the ebook/file would also help me out a lot.

Cheers! 🙂