It looks like Sedum palmerii to me. Have you ever noticed yellow flowers? One pic found online: http://img78.imageshack.us/img78/5268/sedumpalmeriiri2.jpg
Thank you Rosemarie ! I have this cuttings for about a month and never seen any flower on it. The leaves looks like the one on the link you post but seems quite different from this one : http://commons.wikimedia.org/wiki/Image:Sedum_palmeri_1.jpg Which one is the good one ???
To me, the plant shown on Wikimedia looks like Sedum kimnachii, but looking further, I found a site showing plants that look like that one & yours: http://davesgarden.com/guides/pf/go/37083/ Also, the spelling should be with only one 'i'... palmeri. Sorry about that. Maybe others can chime in to confirm this ID or offer other ID.
The Berkeley plant on Wikimedia is Sedum kimnachii misidentified as Sedum palmeri. The shame of it all. You would have thought they would have known better. The Dave's garden link has pix of the real Sedum palmeri, the same as Andre's plant. Sedum palmeri is borderline cold hardy and blooms in early spring.