The home page needs bigger calls to action. I wasn’t confident about the screencast link being useful because it was so small. I also had to hunt for the installation link – it turns out it’s under the “Code” section.

The “hero unit” at the top should contain a big link to install it (appropriately worded to indicate that it’s just sending you to instructions in a README on GitHub). Another big button link to the screencasts would probably help, since most people won’t understand what Xiki is without them. Alternatively, have a “features” page with a list of features and large, static screenshot demonstrating each of them.