Yes, sporadically but usually once I year I give them a donation.

Wikipedia is an insanely valuable resource we as a society just take for granted, especially those that grew up with it. Instant access to nearly infinite information is an absurd luxury we have, and it's a resource I want to see continue without being tied to corporate interests or abusive government regulation.

It's never much mind you, but I try to contribute a little around Christmas time if I can.