Ehm, a little chaos!
Wind has 3 different billing rates for data: <span style='color:#3366FF'>
wap</span>, <span style='color:#FFAA00'>
i-mode</span> and <span style='color:#FF0000'>
web</span>, with the following rates:
in ITALY:
<span style='color:#3366FF'>
wap</span>: ? 0.03/KB (? 0.01/KB inside Wind's portal) [apn: wap.wind] ->
? 30/MB
<span style='color:#FFAA00'>
i-mode</span>: ? 0.01/KB [apn: imode.wind] ->
? 10/MB
<span style='color:#FF0000'>
web</span>: ? 0.003/KB [apn: internet.wind] ->
? 3/MB
outside ITALY:
<span style='color:#3366FF'>
wap</span>: ? 0.05/KB [apn: wap.wind] ->
? 50/MB
<span style='color:#FFAA00'>
i-mode</span>: ? 0.05/KB [apn: imode.wind] ->
? 50/MB
<span style='color:#FF0000'>
web</span>: ? 0.015/KB [apn: internet.wind] ->
? 15/MB
So how much it is with the 3 data offers is listed in the thread sticky in this section, and anyway: 1GB, 100MB and 10MB in Italy, 200MB, 20MB and 2MB outside Italy, using the web apn.
Usually you don't need both wap and i-mode, just configure the phone for web connections (i.e. just put internet.wind as APN).