Great advise, Wheel, thanks!
With traffic I mean, in this case, visitors mistyping the URL of my competitor (hwitewidgets.com) or following misspelled incoming links.
Since I shot first and asked questions later (I set up the 301 already, that is) I'll just leave it and hope just 1 won't hurt me.
But I found some other, less atractive drops (like great-white-widgets-site.com) which I'll just forget about. Not worth the effort of puting up minisites. Should I find better ones, I'll follow your advise: private registration, minisite linking to my site.
Your last remark makes me wonder what other thing you do with drops, but I'm sure you won't tell me ;-)