This is a really great platform and the development is just like with Android using Mono and C#. Since it already has a large install base with Xperia phones, Sony Tablets, and PS Vita (soon to add HTC and Wiki Pad) it is a great place to publish your content. The entry price is great, only $99 a year when you publish and how ever many titles you want.
Consumer wise it is tied to your SEN/PSN account. Controls are touch by default but with Xperia Play and PS Vita, physical controls can be mapped. The platform is open to non gaming aps as well, making the Vita an even greater device. They have a staff curating content to keep shovelware to a minimum and to provide support for some quality assurance other platforms are lacking.
I can't wait for this to hit its stride.
Before the PS3 everyone was nice to me :(
