Behind the scenes: Highrise marketing site A/B testing part 1
37signals.com
37signals.com
Some gaze plots on Nielsen's site show people only allocate 20% of their attention 'below the fold'* http://www.useit.com/alertbox/scrolling-attention.html
* yes, I hate typing that phrase!
From a design perspective, I'm really impressed with how they managed to adopt the sales letter format without it seeming spammy/scammy. A lot of that probably has to do with the typography.