The blue stick looks like DIMM SDRAM to me - the very same thing as the bottom one, though apparently from a different manufacturer.
The EDOs are a very good thing - more about them
on Wikipedia and
Tom's Hardware. It seems you have two 8-meg pieces (from my own experience, one chip on an EDO bar = 2 MB).
They fit into standard 72-pin SIMM slots (unless we're talking about a very old mainboard). Wicked sick for building oldschool machines.
The fourth one is normal SIMM chip aka FPM memory... nothing special about it, really. From the look of things, it's an 8-meg piece.