Are there any recordings of Grothendieck online? Illusie mentions tape recordings of Grothendieck explaining his trace formula and more. Are they or similar recordings online? I guess, even if (what I doubt) everything he thought about that is somewhere in print, it would give an interesting insight in his way of thinking. 
 A: Now you can access the audio lectures that Grothendieck gave at Buffalо in 1973.
Lectures on Topoi
Algebraic geometry
Algebraic groups
Thèmes pour une Harmonie
In the section 1973.
The page is still work in progress.
A: Illusie told me last year that these tapes of his meetings with Grothendieck are somewhere in his basement where they're very hard to find, so they're certainly not online. 
The recording of Illusie's reminisces of Grothendieck to which both posts link has been transcribed here. Drinfeld and Illusie will be releasing a more polished version at some point next year.
A: Will we continue Scientific Research
http://cds.cern.ch/record/912518?ln=en
Allons nous continuer la Recherche Scientifique
Recording number CERN-AUDIO-1972-003
Speaker(s) Grothendieck,A
Date 27 January 1972
Duration 138 minutes
Language French
Keywords Science
Synopsis Réflexions sur la science- responsabilité du savant
Copyright © 1972 CERN
Notes partie 1: exposé partie 2: questions f/a partie 3: questions f/a
Listen to Part 1: Part 2: Part 3:
100 hours of audio of lectures of Grothendieck
http://www.archmathsci.org/catalogue/general-chronology-of-recordings-since-1973/chronology-of-recordings-1973-1980/1973-recordings/
1973 Recordings
Lecture Courses by Alexandre GROTHENDIECK
3 Lecture Courses on respectively
1. Algebraic Geometry
2. The Theory of Algebraic Groups
3. Topos Theory
The copyright of all these recordings is that of the Department of
Mathematics of SUNY at Buffalо.
A: There is a recording of Illusie talking about Grothendieck at The Grothendieck circle.
I couldn't find any recordings of Grothendieck himself.
