Help identifying those cards

Hi all,

I am trying to identify those components and their usage

this one has diodes. front and back views
http://members.cox.net/cluong/unknown1a.jpg
http://members.cox.net/cluong/unknown1.jpg



front and back views
http://members.cox.net/cluong/unknown2.jpg
http://members.cox.net/cluong/unknown2a.jpg


My apologies if the questions are dumb, or posted to the wrong newsgroup.
Also knowing a PN#, is there a good site to help identify components in general ?

Thanks a lot