Hi Shiegeru! Nice to see you playing with the Arduino. I'm sorry it's not working more smoothly.
Hi Mellis,
It was nice to meet you. 
First of all, I just tried with the another Arduino NG rev.C, and it works flawlessly. I also confirmed the board in question with another PC, but still I could reproduce the issue.
I'm assuming you don't have anything connected to digital pins 0 or 1 of the Arduino; if you do, try disconnecting them.
Yes, I don't have anything connected to digital pin 0 or 1 (and nothing is connected to the board).
Are you running any other software that uses serial ports (e.g. daemons for other physical computing platforms or PDA sync applications)?
No.
Do you see the RX or TX lights on the board blink at all?
When I hit the "Upload to I/O Board" button, the RX LED blinks only once. But nothing happens after that...
I hope we can get you up and running soon, so we can start working on more interesting things.
I really hope so. 
Best,
Shigeru