I have switched to channel 6, I didn't notice any difference, but the connection has been working better lately (even before switching channel)

I downloaded netstumbler but didn't get anything special out of it, it just finds my network (and no other networks, other houses are at least at 10 meters of distance) but I don't know what to do with it

another question:

I noticed that when I use the wireless connection to download a rather large file it was downloading at 50/60 KB/s (in the situation above, 7-8 meters from the router with walls etc) instead from the PCs connected with cables the speed is ~240 KB/s (2 mbit line)
is that normal for download speed to be affected by this?

anyway it might have been a slow server, I should try again from other servers...