Timo Arnall talks about RFiD

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The tag itself comes in several shapes and forms, but they all contain antenna and memory, batteryless. They have different characteristics / params according to their shapes and sizes.

Different shapes of the readable volumes of the different readers, example: a figure eight shape (aka "the double muffin") The readable volume (unless outside static is present) has a very smooth surface, this means it can be determined to a mm-value whether the tag is within or outside the readable volume. The direction of the tag in accordance to the reader aslo affects the readable volume. This also directly reflects into the formgiving of the reader and the tag in designing systems.

Graphics - love that dashed line, hehe

Examples of different projects / products with rfid:
swinxs
sniff
poken
the cuteness generator
nabaztag and ztamps - by violet
the tikitag
wine and rfid
brio network - mailbox & emo