Do you know about DBpedia? It's a project that lets you perform complex queries on the content of wikipedia. I've been playing with it a bit and want to share some examples. Try to come up with cool queries!
To query DBpedia, there is convenient form. Queries are performed in SPARQL. SPARQL is a query language that takes some getting used to. So I'll start with a few simple examples.
A query for all articles with an image:
A list of all drugs:
Everything with an LGPL license:
All translations of 'Chair':
All carnivors that had their name stolen:
All married kernel hackers:
All pages that redirect to a plant:
A query for all green plants: