  In this talk, I discuss our recent work concerning the construction of
non-supersymmetric heterotic string models which have exponentially suppressed
dilaton tadpoles and cosmological constants, and thus greatly enhanced
stability properties. The existence of such models opens the door to
non-supersymmetric string model-building, and I discuss how semi-realistic
string models resembling the Standard Model or any of its unified variants may
be constructed within this framework. These models maintain modular invariance
and exhibit a misaligned supersymmetry which ensures UV finiteness, even
without spacetime supersymmetry. I also discuss the potential implications for
phenomenology.
