Ask HN: Best saas sales/landing page

I'm going to be taking my new saas product out of closed beta shortly, and am just getting into designing the homepage.

What are the saas sites that you've seen with GREAT homepages which really get across what the company does, and why you should sign-on?

The ones I've looked at are

http://basecamphq.com

http://google.com/apps

http://zoho.com

http://www.olark.com/portal/

http://posterous.com/

http://www.weebly.com/

https://www.wepay.com/

https://www.cloudkick.com/