Direct links to a few resources worthy of exploration:

DjangoBooks a most excellent resource run by a most devoted scholar

Michael Dregni's 'Django' a 'must read', the quintessential history of Gypsy Jazz.

Bury Me Standing (excellent book, available on Amazon.) Also see Jan Yoors "Gypsies".

Some additional links not to miss:

DjangoInJune a local festival (Northhampton, MA) that's growing every year

CommonFenceMusic thriving local world & traditional music organization

PeepToad CoffeeHouse bringing the best folk and traditional music to the Northern RI area.

Django Reinhardt Swing Page (UK) older British site full of great references

GypsyGuitars.com run by a leading expert on Maccaferri

La Chope Des Puces (Ninine) a must-see when you're next in Paris!