I just finished building an AM receiver. I'm very happy with how it turned out. Basically, its a reflex receiver with an amplified output. The receiver uses 2 3904 BJT's, the preamp uses 1 MPF 102 FET, and the final output is fed to an LM 386. I did not design the orignal receiver portion, but I modified it somewhat to improve the selectivity and lower the distortion.
Details and pics are on my website here: