The RHESSI mission has ushered in a new era of solar
flare research by providing us with unprecedented X-ray images 
and spectra of solar flares. In this talk, I will give a brief 
overview of the RHESSI satellite, its current status, and present 
some new and exciting scientific results. In particular, I will 
focus on several interesting features observed in the April 21, 
2002 X1.5 flare.