Hi,
I have a problem which I've encountered on two different computers, on two different wireless 802.11b/g networks, so I suspect it might be a generic issue with 802.11 networks.
For example, I'd bring my laptop to school. It's a MacBook Pro, by the way. For like a minute or so, the network will work just fine, giving speeds of 1 MB/sec and more (seems to be limited by the remote host). The signal strength is 70%-80% in iStumbler. The following minute, however, everything stalls. No data transfer possible. Another minute later, everything works again.
Do some access points "cycle" the available channels or something like that, giving times to each client for a specific period of time?
-- Sune