Does anybody know how to take an SD card image, lets say from a 16GB card and create
a small image from it, like the images on "latest images" section of the beaglebone.org site?
If you use Win32 Disk Imager, it makes a nice 16GB image which is too large to send.
Inquiring minds would like to know 
You can just use dd and write an image file, then copy that wherever, if you have a tuition that only takes up part of the card space. Like
dd if=/dev/mmcblk0p1 of=/mnt/data/image.iso
Obviously you’ll need to customize that command and you should either use the dd man page or the internet for more information.
On the other hand if you actually have 16g partition then you are going to have a much harder time of it.
J