Maybe try putting more information on your landing page. People would be more likely to sign up if they had more than 5 words to figure out what your startup does.
I added more information to the landing page. The issue isn't necessarily with the # of signups but more to do with traffic. Currently I'm converting 10% of my visitors to signups. But I'm not getting a lot of traffic.
I'd not be happy with a 10% conversion rate (unless the traffic is not targeted).
Here are some suggestions I can make:
To increase traffic:
* If you have some budget, why not try the good ol' PPC route? Even a short (yet smart, tight) campaign on AdWords should get you a good number of signups mighty fast.
* Find (as many as you can of) blogs, forums etc. related to recipes, grocery, dinner planning etc. and make useful/meaningful posts with your URL in sig. - make sure you don't spam though ;-) (As you probably know, there are some excellent, inexpensive, non-spammy forum/blog posting services out there. You can shop around a bit and use any of these if you wish.)
Also, no matter how you increase traffic, increasing the conversion rate will obviously get you more signups.
To increase conversion rate:
* I'd strongly suggest adding some more text to the landing page. I think something like what you wrote here:
>>
Dinner Planner allows people to plan out their daily meals in an organized and efficient manner, share recipes with friends and even organize your grocery list. We send out daily reminders to people on what they're cooking for the night.
Tonnes of features are planned including SMS notifications, subscriptions to weekly menus, generate meal ideas based off what ingredients you currently have.
<<
placed as a blurb (not too large font size) somewhere to the left of the sign-up box can boost conversion.
* A somewhat stronger 'call to action' should also help. I think even something as simple as 'Your E-mail' displayed inside the text box should boost sign-ups.