1. Increase the font-size from 13px to 16px and set line-height 24px to make the type friendly.
2. Increase the height of your input fields and buttons to 28px to make them easier to focus and click on.
3. For the diary image on your front page, show a diary that has something written in it. Even better, show a screenshot of a Duuble diary.
4. Combine "First name" and "Last name" fields into "Your Name" for better internationalization and less visual elements / tabbing.
5. Move the "Tweet" button away from your sign up form to top right of the page. Use the official Twitter button. People are used to it.
6. The "Read more about Duuble" button should be a link not a button.
I didn't even notice the 'read more about Duuble' button until I saw it mentioned by jorangreef above (point 6). It isn't in a very obvious location and isn't particularly eye catching, mostly due to looking like the other buttons and having a small font.
By comparison, Springpad has an easily visible 'How it works' button in the top-right corner, next to the create account button (https://springpadit.com/) and Simplenote has a link called 'More reasons to use Simplenote...' in the bottom-right corner (http://simplenoteapp.com/). These are much easier to find.
Also, I assumed your headings (It's Simple, Private, Posting, etc) were links to more information, since they didn't have any content below them explaining /why/ Duuble is simple, private, etc.
In summary, you really need to sell the product by clearly explaining what it is and why I would want it. I think the front page design could use some general improvement, as suggested by jorangreef.
Good work so far.
A lot of walking down the street!
Also, having a bookmarklet for a pop up version of the "Just Post" page might be quite neat.
Signing up was fairly quick. However making my first post was a little troublesome: Hitting the "enter" button when didn't seem to post anything. The overall feel here feels less like a diary and more like a self-contained twitter feed. I think it's the atmosphere of the application that is throwing me off the most.
Congrats on shipping a product though! I'll continue to try it out.
Still have no idea what this is.
Design wise, just be careful with using such light grey text on white background, as you can barely read some things. For example, the "bars" layout is unreadable on my screen unless you hover over a post.
Is there any API so I can send feeds through command-line. I already have a bash script called "whatidid" which logs to a text file and mails the file to my gmail account. I could push it to duuble.
Why does a daily dairy site has to be like twitter? Yours is a original concept. Pour some thoughts into it and come up with original design. :)
