A year or so ago I came across a feature request system where customers could request a product or feature request and vote it.
The system was nice as every customer got three votes that they could assign/unassign to whatever request they liked best.
But this was not a bug tracker. It had a much cleaner and simpler interface than most bug tracking packages out there.
I can't for the life of me remember what site I saw it on or what package it is, does any one know of any package that offers such functionality?