Pineapples commercially induced to bloom and fruit by spraying with a dilute solution to 2,4-D, among others, such as various growth hormones, and ethylene gas. (Mentioned by my botany professor -- 40 years ago, as an illustration that toxicity is in the dose)
Survey of induced flowering in pineapple in brazil Raft of references in the article.
Paper in the Bromeliad Society journal
I've seen citrus bloom and bear fruit indoors, but usually the smaller ones. Kumquats and such.
Try on the gardenweb forum, and on the UBC botanical forum.