I suspect what you're talking about are kerupuk (which would fit in nicely with Dr. Bill's alphabetical list about now). They come in a wide variety of shapes and sizes.

I couldn't find a decent picture of kerupuk, but here's one (complete with recipe (only in Indonesian unfortunately)) of rempeyek, which are similar in shape to some kerupuk and which I actually prefer:

http://cyberwoman.cbn.net.id/detil.asp?kategori=YourTips&newsno=66

Bingley

Bingley