I always just thought this was called a "Crinkle Plant", but when I started to look around for how to care for it, I've really drawn a blank on identifying it. If anyone knows what it is, it would be a great help to find out - especially if they can also let me know how to care for it. I'm still developing my green thumb :)
Pilea nummularifolia / Creeping Charlie. I don't have this plant to tell you the care, but it looks like your doing a good job with it. http://www.mob-zabrze.pl/flora/foto/pileanummularifolia.jpg
Creeping charlie is a pretty low-maintenance plant. Water it lightly when it gets dry, make sure it gets lots of sun, and fertilize it once every two or three months. After a while it will bloom for you with little purple trumpety-type flowers that smell somewhere between lavender and mint. I had a lawn out of creepie, and it was better than grass.