Hello,
Thanks for the link. I have opened Avialogs 6 weeks ago now. Some details about the site:
- Registration to download has been done in order to avoid people using bots to mirror all the content.
- I add new content every two days with a "featured" content each week. next one will be all Messerschmitt 109 manuals, there will be a lot of russian docs published too (Lisunov, Polikarpov, Tupolev..), jets and bomber from the 50/60, classics aircrafts, experimentals, etc
- If you have pdf version of flight manuals for experimental aircraft in pdf and you want to share them, please contact me 
- feedback about the site is welcome, what kind of documents you would like to see, etc...
Right now there are 275 documents in the database for around 200 aircrafts models.
Benoit