[IronPython] how to use Predicates in IPy?

[Count László de Almásy]

I've been unable to find any examples of how to define/use Predicates
in IPy, as for use with .NET's List(T).FindAll method. Specifically
I'm trying to use
http://lib.openmetaverse.org/docs/trunk/html/M_OpenMetaverse_InternalDictionary_2_FindAll_1.htm

Anyway, if someone could help with an example of how to do such things
in IPy I'd greatly appreciate. The one mention of it in this list's
archives is from 2006 and refers to an example url that is now broken.

-- 
Cheers, László