This depends on the algorithm of hubpages. We do not know it, but some general guidelines are: quality hub (includes quantity as well), lots of unique vote ups, comments, traffic from other sources. My hub quotes about moving on has been on the hot list for a week. Today it was in the first place for some time. Quite happy about it. However, if I knew the exact formula I would send all of my hubs there. Well, everything has to be natural. Hope that helped.