Complete Noob, need advice

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hi there, i'm new arduino, understand methods used ethernet shield applications, need help.
i want make device connected tripwire on of letterbox, when flap opens wire tripped , device sends me tweet on twitter, telling me have post.
from undestanding need arduino duemilanove thingy, ethernet shield, laser diode, mirror, ldr .
could guide me else need, such power source use?
and once have linked pc, how programme tweet me?
sorry being noob, simple blinking led light project doesn't fill me joy -.-
p.s in uk , use windows 7 pc

you need ethernet cable between ethernet shield , ethernet port on router connected internet.  power can supplied on ethernet cable if optional power on ethernet (poe) module on ethernet shield , router can supply poe.  otherwise should 9v 'wall wart' power supply can plug power jack on arduino.

look @ files->examples->ethernet->twitterclient example.


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