Below a selection of various presentations by Just, starting with the most recent.

"Implementing INSPIRE with Free and Open Source (for Geo)" - OSGeo Bolsena - June 11, 2010
[HTML Slides] [PDF Slides]

"INSPIRE Implementation in EURADIN with Open Source" - Het Kadaster - March 23, 2010
[HTML Slides]

"The Wonderful World of Open Source Geo" - JavaKnights - September 18, 2009
[HTML Slides]

"7Scenes" - OSGEO Hacking Event, Bolsena (IT) - June 25, 2009
[HTML Slides]

"GeoNetwork Jeeves Tester" - OSGEO Hacking Event, Bolsena (IT) - June 24, 2009
[HTML Slides]

"7Scenes" - JavaKnights - April 10, 2008
[HTML Slides]

"GeoTracing" - FOSS4G - September 14, 2006
[HTML Slides]

"Pushlets" - Postbank/ING - September 29, 2006
[HTML Slides]

"GeoTracing" - Waag Killerclub - Dec 14, 2005
[Arty HTML!]

"Frequency 1550" - NLJUG JSpring - May 12, 2005
[HTML Slides] [Session Description]

"Frequency 1550" - Waag - February, 2005
[HTML Slides]

"Multi-user Networking" - Deaf03 - V2 Rotterdam - 2003
[HTML Slides]

"Multiparty/Multimedia Services to Native ATM Desktops" - HPDC - August 1996
[HTML Slides]