This post was originally published on February 20th 2011, since new documents are still added, I make a duplicate to put it back to the top:
IFR:
- EU OPS (accurate at this date)  (eng) (eng) (fr) (fr)
- IR knowledge summary (91p)  (fr) (fr)
- official DGAC revalidation test form  (fr) (fr)
- Jeppesen Enroute Chart Legend (intro ONLY)  (eng) (eng)

- IFR practices courses  (fr) (fr)
- revalidation course guide (EPAG type)  (fr) (fr)
- IFR nav log (EPAG type, my favourite so far ^^)  
- IFR journey preparation (ESMA type)  (fr) (fr)
VFR:
- Visual Flight Rules (2009)  (fr) (fr)
- VFR reminder  (fr) (fr)
- Airspace class, ground/air, tower/air, interception signals reminder (very useful!)  (fr) (fr)
- QNH, QFE, FL (a brief reminder)  (eng) (eng)
Misc:
- B737 500 IRS FMS (‘can’t remember where I got that!)  (fr) (fr)
- Meteo aviation guide (*UPDATED* Meteo France file 2011-2013)  (fr) (fr)
- G1000 manual (DA42)  
- G1000 DA42 virtual training program  
- GNS 430 Trainer (a program)  
- GARMIN 400 Series Trainer (another program)  
- Licenses validity/revalidation conditions reminder  (fr) (fr)
- virtual log book (automatic hours counting! -courtesy B.L-)  
- detailed log book (excel file courtesy S.G!)  
- blank flight plan  
- How to fill a flight plan  (fr) (fr)
- BIA exam (full feedback, 2004 test questions + answers!)  
- QCM for ULM test (training program – 878Q)  (fr) (fr)
(updated 18/02/2012) As usual if you have anything to share with us you know the door.