I feel like this must be a duplicate, but I couldn't find it.
It would be awesome if SO solved the Netflix problem. In other words, it would be nice to have a tab of the home/questions/unanswered page which prioritized questions you are likely to vote up based on your previous voting history and the voting histories of users with similar tastes. Aside from being thoroughly excellent, this feature would help solve the problem that people don't vote on questions. It would clarify the meaning of an upvote: it means, "I want to see questions like this."
The main objection I anticipate is that it would be computationally intensive and require heavy querying of the database. The load could be lightened by requiring 1k (or maybe even 10k) reputation, like the show total number of votes feature.