A couple of hints for those of you traveling through France specifically: 1) residential Wifi networks that are "accidentally" left open by ignorant users are getting very, very scarce indeed, simply because for the past few years all DSL providers here have been shipping set-top boxes instead of plain modems. On top of the usual Internet connection, these also provide TV and telephone (VoIP) services, and can be configured as routers (with NAT & FW) and/or Wifi APs. In the latter case WEP (and now WPA) are automatically applied without user intervention.