[nanotone]

Extrapolating strictly from my own browsing behavior while reading the first few on this list, I've noticed that the more interesting I find an article, the more tabs to linked Wikipedia articles I open up for further reading.

Of course, articles with more links are likely to spawn more tabs, so this score would be expressed as a fraction of the total links in the article that were followed.

That's just for starters; none of this considers the actual text of the article. Once you throw in semantics...

EDIT: I generally don't follow links to articles on more well-known topics [e.g. places], but that shouldn't penalize the article. So there needs to be a ranking for well-known-ness, and consider the fraction of followed links to articles that are less well-known.