Use AdLabs Demographic & KW Tools
The MSN AdLabs tools aren’t popularly mentioned in the SEO world, but they’re incredibly valuable, and from what I’ve seen, pretty accurate.
- Demographics of your competitors’ sites – http://adlab.msn.com/DPUI/DPUI.aspx
- Detect commercial intent – http://adlab.msn.com/OCI/OCI.aspx
- Find “similar” keywords – http://adlab.msn.com/contextSim/Default.aspx
- Cool results clustering (determine what pages are related) – http://adlab.msn.com/SRC/SRC.aspx
- Seasonal keyword forecasting – http://adlab.msn.com/Forecast/
- Content categorization – http://adlab.msn.com/kts/CCAT.aspx
- Search funnel data (useful to understand a query path) – http://adlab.msn.com/SearchFunnel/
The full list is here – http://adlab.msn.com/default.aspx – note that you need to use IE for many of these, as it breaks down in Firefox 
