I had AirDroid running on port 8888 on my HTC G2, until it DIED on Friday. I got a new Samsung Galaxy S II, and AirDroid was one of the first items I installed. 
As soon as I turned it on, I activated "Predetermined password", and then noticed the port wasn't 8888 by default. So I changed it to 8888, and it said I should restart the app to make the change. I did, and it came back up with port 9100. I thought that was odd. I changed it to 8080, then stopped and restarted the app, and it stayed put at 8080. I've repeated this several times: If I try to change the port to 8888, it comes back after the restart as 9100, but if I make the port 8080, it stays at 8080. So, now I'm connected, using 8080. I have no idea why it might shift itself like that.
Interesting...
--Chuck
As soon as I turned it on, I activated "Predetermined password", and then noticed the port wasn't 8888 by default. So I changed it to 8888, and it said I should restart the app to make the change. I did, and it came back up with port 9100. I thought that was odd. I changed it to 8080, then stopped and restarted the app, and it stayed put at 8080. I've repeated this several times: If I try to change the port to 8888, it comes back after the restart as 9100, but if I make the port 8080, it stays at 8080. So, now I'm connected, using 8080. I have no idea why it might shift itself like that.Interesting...
--Chuck