Q:

Arduino Tweeting Weather Station

I want to create an Arduino Weather Station with
Temperature
Rain Gauge
Wind Speed
Wind Direction
Humidity
What peripherals should I be looking at getting? 
Ideally I want this project to tweet the results - how do I do this? 

A:

Sparkfun has a pretty comprehensive weather meter package that sounds like what you want listed as a SEN-08942 Weather Meter.  For tweeting it depends on where it is, if you have WiFi available you can get a WiFi shield or if Ethernet is available an Ethernet shield.  If neither of those are available you can use a cell phone data connection. 

A:

Get yourself an Arduino board + ethernet shield.  You'll need sensors (temperature, wind, humidity,...) aswell.  You'll find a huge selection in your preffered online tech store.  Then, learn some low level programming on Arduino, involving the ethernet library, code a small webclient and off you go.  It's not rocket science ;)

