The idea is to make sound profiles easy to preview and provide instructions on how to install the themes. I've played around with the two additional themes on the site (there's actually three on the alpha website, but the I already have the Ubuntu theme!) and it's easy to preview and download the themes.
Let's hope this great idea grows.
Sources & Preferences:
- OMG! Ubuntu!: Ubuntu Sound Gallery could make finding and installing sound themes easy
- Dylan McCall: Ubuntu Sound Gallery (alpha)