Our web app (free to use) was released earlier this year, it's pretty simple and I'd be keen to get your views the UI. http://www.tabzon.com. matthew@tabzon.com
The demo video audio didn't work, so I couldn't figure out exactly how to use product. There's also no help section or features section, which left me guessing on how to use product and what problem it would solve for me.
Minor UI issue I noticed, in Chrome, the background images on the signup page show a light grey background instead of the darker page background.
If you can fix the audio issue, I'll take another shot at reviewing.