Hi,
So After my yesterday's post i've ordered the Duemilanove. Now i have 15 days before i get it (international delivery! 
) But i'm very curious about trying my programming skills. So is there a simulator i can use?
cheers,
Pracas
I don't believe there is a simulator, but you can use the IDE to write programs (sketches) and compile them.
(If your C skills are anything like mine when I started, just getting things to compile will keep you busy ;))
Enjoy
In the absence of a simulator, maybe you could post your code here and one of us (time permitting) will upload it to one of our Arduinos and tell you what it did? 
I know it's hard to wait for that first shipment.
well i've just been compiling it so far... nice idea but that would be too much work for everyone and i still dont get to see what it does... its ok... 12 days to go!
ATMEL has a simulator for the AVR chips, it's called AVRStudio. Although it's not an Arduino simulator, you can actually run and step through C code in the simulator. You probably just need to open your .ELF file with AVRStudio (I use AVRs but not Arduinos so I can't guide you through the exact steps as applied to Arduino).