How to germinate, um, anything.

This is a very impressive resource:

Handbook of Seed Technology for Genebanks - Volume II.
Compendium of Specific Germination Information and Test Recommendations (IPGRI)

This is essentially an online book, from the Interntaion Plant Genetic Resources Institute. It's aimed at curators of germplasm collections, so it's pretty technical, but there's a ton of good information there.

I find one of the most maddening experiences in horticulture is starting with a limited supply of seeds and watching in despair as they fail to germinate.

(This isn't really a fruit-specific resource, but since it covers practically everything, the fruits are all in there.)