http://www.guypo.com/business/17-statistics-to-sell-web-performance-optimization/
Really handy post with links to sources of web performance optimisation statistics.
http://www.duedil.com/
Free access to companies house data with a social overlay. Potentially includes data that Companies House charge for.
http://kwiksurveys.com/
Neat survey tool which is apparently free. Might have ads, didn't notice (adblockplus).
https://www.kissinsights.com/
A cool little survey tool that uses a javascript slide out to ask questions of visitors. Free for a few surveys with ads, or $25 - $29 a month for no ads and more response tracking.
