I like it! Clean landing page.
I'm also a big fan of practicing gratitude daily. It's great for stress relief and overall well being. I think the audio prompts are an easy way to get people started.
My main feedback would be to get clear on the end result. Is it capturing life's moments or achieving goals?
I'd also consider have a middle section with "How it Works" so people can visualize what they'll be doing. Like a 3 step process.
For the framework, the iPhone app is written in objective-c with a bunch of open source controls from cocoacontrols.com
Thanks for looking!