Heaps of PDF presentations are available at this page. Here are some direct links:

Revit Architecture Forum (17th May 2011) Event Summary and Presentations 31.8MB

Revit MEP Forum (18th May 2011) Event Summary and Presentations 29.9MB”

Revit Structure Forum (12th May 2011) Event Summary and Presentations 19.6MB

Design Visualisation Forum (11th May 2011) Event Summary and Presentations 5.4MB

AutoCAD Civil 3D Forum (13th May 2011) Event Summary and Presentations 16.1MB

From
Spring User Groups in London:

Just came across this search engine for PDF, DOC and PPT files. It is called http://www.osun.org/

http://lumion3d.com/

For example, lets say you wanted to see what PDF files are available that include the words ‘ revit families’. Have a look at the results by following the link below:
http://www.osun.org/revit+families-pdf.html

This could be a very useful site for quickly searching for quality data. If Google can’t find what you are after, give this site a go.