Kuki Linux is a custom Linux distribution designed for Intel Atom powered netbooks. It’s based on Ubuntu, and optimized to work with Acer Aspire One netbooks.
Like many netbook-specific Linux distros, Kuki is maintained by just a few people — in this case, just two. And due to personal issues (health and unemployment related), neither has much time to maintain the OS at the moment. That means the project is currently on hold.
You can still download and install Kuki from the project web site, or participate in the user forum. But it sounds like we shouldn’t expect any major updates for a while.