I'm in the UK and have a NETGEAR DG834G ADSL modem/router and it works with my iPRONTO.
Kind of.

Every morning I have to boot up my laptop with NETGEAR WIFI card in, the iPRONTO can then connect to the network for what I believe to be the rest of the day. If I do not boot my laptop then the iPRONTO will not see the network.
Oh well, at least I know a way of getting it to connect !
One other contributor has suggested a card that is compatible with the iPRONTO, but as far as I could tell it was an old card (probably out of production) and a US manufacturer.
I suspect that changing the WIFI card will probably solve my problems too.

Steve