Song charts
Club Django make a lot of use of the Robin Nolan Gypsy Gig Book - you can get a copy directly from the man himself -> here.
Djangopedia - discography of every Django recording
Hotclub.co.uk - comprehensive song directory
Guitare Jazz - A source of song "grilles"
Playing
Hotclub.co.uk - a good little compendium of Django style playing tips (no sadly archived and no more)
Guitars
You can play Hot Club style guitar on any steel strung acoustic, but a Manouche style guitar will give the distinctive percussive punch and trebly tone. You can get the tone easily on most steel acoustic guitars by playing nearer the bridge (but not necessairly the volume).
Hobgoblin - Stockist of low - medium priced Gitane instruments.
Mairants - good selection of budget and mid-priced Manouche style Modele Jazz and Grand Bouche guitars, and occasional Dell'Arte and other big ticket models. The also have the best selection of arctop guitars in London, but if you're after something special see also Vintage & Rare in Denmark Street. Outside London Foulds in Derby, has a great reputations for Jazz guitars.
JWC Guitars - Great mid-priced and expensive Manouche style guitars
John LeVoi (and here) - Handmade Manouche style guitars to order - is also believed to be maintaining guitars made by the late David Hodson