Arduino project with twitter

Thanks for the extremely quick response, I think once i have spent some time experimenting and getting used to the basics the construction shouldn't be too difficult to work out, Ive attached some images of a card and an acrylic mock up just in case anyone is interested.
Would there be a program you could recommend me to use for this? For the sake of the project a host pc running an application would be enough to show my end result, But if its a success i would like to put everything online for other people to make if there interested!.
Unfortunately the last two options are not really available to me right now due to having no money left over, But still thank you for future reference, Ive had a look into the Arduino wifi shield's and will definitely purchase one in the near future.

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