Congratulations!
Your website design is incredibly well polished and the site is put together really well and you message is communicated really well. Did you design the site by yourself ? Please share your design tips/resources.
I like the "Perfectly Safe, Perfectly Simple, Perfectly Free", but stylistically it's quite different from the infographic on top. The logo is also a bit off from the rest in style. And the call-to-action button is a bit washed out. The main menu has horrendous choice of colours.
The sign-up form has a lot of empty space that makes the page look only half done. And there is some lack of consistency on how you style forms in general. (Grey background for the whole form or just the submit-button panel?)
All minor things, but going over them a few times could really improve the finish a lot.
You might want to present your layout on forrst.com. If you don't know it already, it's a community with the focus of bringing hackers and designers together. You can usually get some good constructive feedback there. If you need an invite, let me know.
ETA: The Upgrade plan > Hide link manages to replace the page with "[object Object]"; the password field is mandatory but lacks the asterisk.
btrax.com gave us 10 hours of free design for winning startup weekend. I highly recommend them.
copywriting was by joanna (she's a real pro see this thread for background: http://news.ycombinator.com/item?id=1836538)