Is there a simulator for arduino or for landslide monitoring? =(
we will be using arduino to be interfaced with xbee and sensors for our thesis 
There are two Arduino simulator apps for iPhone/iPad in Tunes store at
http://itunes.apple.com/us/app/arduino-simulator-learn-diy/id438426863?mt=8 and,
http://itunes.apple.com/us/app/arduino-simulator-full-pack/id447001317?mt=8
Presently the capabilities are limited and are evolving. Some info on capabilites is at http://schogini.com/tutorials/arduino/#C3
The right search in Google turned up these results:
http://www.oshonsoft.com/avr.html
http://webscripts.softpedia.com/script/Scientific-Engineering-Ruby/ATMEL-AVR-Simulator-32950.html
http://www.amctools.com/atmel.htm
http://compilers.cs.ucla.edu/avrora/simulator.html
There were a few more, but I guess you'll find something useful there. Also, you can have a look at avrfreaks.net in the Tools section as I'm quite sure some more software will be there.