Graphene, a two-dimensional single atomic layer of carbon, has recently emerged as a promising candidate for electronic materials, as well as a new model system for condensed matter physics. In this talk I will present our work on mechanical, thermal, and electrical properties of suspended graphene devices, such as ripple texturing, negative thermal expansion, spontaneous symmetry breaking and gap formation in bilayer graphene, and stacking-order-dependent transport in trilayer graphene. Our results have implications for band-gap engineering for graphene electronics.