Maybe I'm being naive here, but why aren't registrars a first line of defense here, at least on the names of the biggest online services, major banks and credit cards? Seems like it would be an easy thing to raise a red flag on a requested regitration for any name that contains "paypal", as an example.
And yeah, you're being naive, tedster. :)
Fortunately, there are some registrars out there who will take time to handle this. However,
it's a matter of finding out who. (I have 1-2 candidates in mind who, I'm sure, will indeed
proactively handle this issue...)
Not to mention there are hardly any laws authorizing registrars to handle this. (I think...)