Why Ubuntu Suits Tablets and Phones
As far as Canonical is concerned, their Linux distribution is ideal for all manner of different devices. This is of course true of all Linux distros, but Canonical is one of the few development teams to focus on multiple hardware types. Usually developers focus on a single device, typically standard computers but occasionally routers and web servers.
Canonical has proved over the past few years with the standard releases of Ubuntu and those designed for netbooks that there is a market for their operating system on different devices, and with the Unity user interface they have a new touch-based system for users to interact with Ubuntu without resorting to a traditional mouse and keyboard combo.
Additionally, the release of the Ubuntu Software Center has also signposted the recent Canonical announcement; this tool allows users to quickly find and install software for Ubuntu without resorting to the potentially confusing Synaptic Package Manager. Basically, it's an app store.
In truth, beyond these two developments, Ubuntu is no more suited to phones and tablets than any other distro. Yet Canonical is the only Linux developer ones looking to challenge Apple, RIM, Google and Microsoft for a position in the mobile market.