Colorful sketchnotes from Amanda Wright from UX London 2011. See the entire UX London set on Flickr and read the UX London 2011 post too.
Jason Bootle also captured sketchnotes at UX London 2011. Full UX London 2011 set on Flickr.
Sketchnotes from Sam Smith of the same event. It's interesting to see Sam's more radial approach to capturing information on a two page spread.
It's always fascinating to me how different everyone's sketchnote approaches are.