Hello, I'm new to Arduino. I would like to connect a weatherstation(Lacrosse WS2300) using a com shield. Then I want to connect the arduino to the internet using a ethernet shield to send the weather data to a website.
My question is, is it possible to connect two shields to the arduino?
thanks in advance 
Some shields can be stacked. Others can't.
Some shields can be stacked on top of others, but can not have anything stacked on top of them.
If you provide links to the shields you are considering, we could tell you whether they play well together.
this is the ethernet shield:
http://www.cutedigi.com/product_info.php?cPath=284&products_id=4222&osCsid=3dfb8494b0be0f69623563efdd6c9023
and this is the rs232 shield:
http://www.cutedigi.com/product_info.php?cPath=284&products_id=4329&osCsid=3dfb8494b0be0f69623563efdd6c9023
actually I haven't found any other rs232 shields, so if anyone can recommend another I'm grateful
It looks like the ethernet shield ties up pins 10 through 13 (this is typical), while the RS232 shield only connects to pins 0 and 1. Both are stackable shields, so you should be able to use either one on top, presuming that there is clearance. The ethernet shield has the SD card on the bottom side, so it might interfere with the RS232 connector.
Another alternative is to use an Arduino with an RS-232 interface. That's what I did to put a Davis weather station on Ethernet.
Thanks for the answers, I already have a Arduino Duemilanove and can't afford a new one 
@ron: may I ask what software the Davis weatherstation works with?
Or have you written the complete code yourself in Arduino?
Cheers