tiny transmitter

I have been doing some research on creating a tiny transmitter...I mean really tiny. what I have come up with so far is the use of an 8 pin soic available from melexis ...this one actually

**broken link removed**

the basic use for this would be for tracking ..... basically follow signal strength to the source...kind of a hide an go seek type thing. My only question is weather I have this chip figured out correctly or not, so I was wondering if anyone could give me some advice for the thing...or know of anything smaller or more easily used.

Thanks.

:cry:
wat ever you do keep me inform about the transmeter or may be reciver.
Thanks