I'm the author of that widget, thanks for showing an interest in it

Yep that's right, it's indeed a widget to check your balance on Mobile Vikings, a Belgian GSM/3G mobile operator.
I put it online so I could let someone I know test it before really announcing it to people, but unfortunately he encountered the same problem as f2thak: not being able to see the widget at all. I presume it's a missing dependency, and I was going to look into that over the weekend

That it asks a password and username but doesn't do anything with it, that shouldn't happen either: what happens if you just click again on the widget?

In any case, I'll update the description of the package too so that it's clear for everyone what Mobile Vikings is