Rule #1 of a release announcement: don't assume we already know what your product is . Every time you fail to give a 1-sentence elevator pitch in your blog post, hundreds of potential customers say "meh" and hit the back button, taking their thousands of friends, family and colleagues with them.
And also I think it would be a good idea to put an easy link to the main site at the top of your blog, and maybe that 1 sentence elevator pitch as the subtitle. Your main site mentions nothing about pricing. I'm assuming it's all free at the moment, will it always be, are ads part of the plan or will premium features be turning up later? [edited to be a little less abrupt]
The free sign-up appears to let you have unlimited tasks but only organised into 2 lists, and for either $1.99/month or $19.99/year you can get Cheddar Plus for unlimited lists.
I'm not saying they're wrong in this approach, but my gut reaction was that it felt 'off'. Thanking on it a bit, if it was me, I'd probably have limited the total number of tasks in the free account, but left the number of lists unlimited.
I'd want people to be able to organise lists however they wanted, but find themselves running out of task items. If users have a limited number of lists before they decide to buy a Plus account they can only create muddy generalised lists, rather than specific well organised ones.
With users able to create better organised lists the app would hopefully seem much more useful and organised and leave a more positive experience.