hey, i too have this. I have owned my nokia n900 for 2 weeks now.

and a few days ago i dropped it on pavement when getting out of the car.

Since then i notice that the screen makes this clicking sound when i press on it. I must say i am not impressed.....
I was not sure if this was just from it falling or if it happened before, and i just didnt notice (i did a pretty good inspection after the fall)

I am also a bit disappointed overall in its ability to handle falling, although nothing seemed to break.. it really does not seem that sturdy anymore.

I had an Xperia x1 before this, and that was the toughest phone i have ever seen. Mine had falled on pavement probably 100+ times, and rolled down stone stairs, and even fell into a puddle 2 times. It still works GREAT!

i must say i have never used a phone that was built as well as the X1 since.