Whilst looking at the previous site (Safer Internet Day), I also found the EU Kids Online site http://www.eukidsonline.net/ (a project based at the London School of Economics), which includes a lot of interest. There is a press release giving a summary of findings from a report released today about the extent to which parents in different European countries worry about and monitor/control children's use of online.
Other resources include a searchable database of research, and a report published last year:
Hasebrink, U., Livingstone, S., Haddon, L. (2008) Comparing children’s online opportunities and risks across Europe: Cross-national comparisons for EU Kids Online. London: EU Kids Online (Deliverable D3.2). http://www.lse.ac.uk/collections/
I haven't had time to look at it properly but it seems to have a good summary and analysis of the risks and benefits, as well as statistical comparisons.
Photo by Sheila Webber: it's tiring being a snowman, Western Park, Feb 2009