where did you buy the wood? can you look at other things they normally stock? sometimes it helps.
exotic # 2 is purple heart.
for domestics - 2, 5, and 8 are all pretty light, my guess is maple. I don't usually see poplar where I buy my "good wood" usually only at the hardware stores so that is why I am guessing that.
#6 looks like oak, and 3 could be also, but it is hard to tell from the picture.
1 and or 7 could be cherry