Are other titles available?
Yes there are. Oil Rush, for example. You can browse the Linux only games by going to the game browsing page and clicking the Tux in the upper right hand corner. The Humble Indie Bundle was popular and came with Desura keys, so a lot of people can test using Desura without having to buy a game straight out from them.
Are other titles available? Does this mean EA is going to start doing Linux ports through this?
I *highly* doubt EA will ever start doing Linux ports and if they did, they'd find a way to bring Origin to Linux to do it. But Desura acts as a game distribute service that goes across Windows, Linux and soon to be OSX that developers can utilize when creating cross platform games. I welcome Desura and will be using it for future game transactions since Steam never decided to make a Linux port.