How to create sales pages, squeeze pages, landing pages, etc.

Hi,

I just searched on sales page, squeeze page, etc., and since I'm pretty new here, I figured I'd ask how folks are handling such theme variations around these parts...

In general, I create a custom field, like "nonav" and remove all the navigation elements and then write code into template itself.

However, since this is a community of businesses, I'm guessing there may be a less "manual" and easier way to handle the creation of:

video landing pages
other squeeze pages
single column sales pages

---all of them having no navigation at all

For one of my sites, http://www.curetinnitus.org, whenever I have the menus available on the sales pages, conversion percentages drop immediately. It's a huge drop too.

So, what are the best practices for creating theme variations for sales pages, squeeze pages, landing pages, etc.?

Best,
Dainis