Type Ia Supernovae (SNe Ia) provide our most mature probe of dark
energy. I'll report on the latest dark energy constraints from the
Supernova Legacy Survey (SNLS), and show how new physical effects in
the SN Ia population are refining their use as cosmological probes.
I'll also show the first results from the next generation of local SN
surveys designed to replace existing low-redshift SN Ia samples,
including details of new and exotic cosmic explosions.