To me, the technical solution is to incorporate the relationship of the upvoter* to the poster in the "hotness" algorithm. If I upvote every single item from jacquesmatteij.com then my "this is awesome" signal isn't as strong as someone who only upvotes 10%, or who has never upvoted him before.

* When multiple bots submit the same link, "submission" is basically the same thing as "upvoting".