Free Alexa ranking alternatives?

Looking for a free resource on high traffic sites.

[Hennatron]

Are there any free resources that will tell me the highest traffic sites per sector or something very similar to that report?

Thanks

[edit_g]

Sign up for the hitwise and redsheriff newsletters, watch their press releases and eventually they'll come 'round to your industry (unless you're in the landscape gardening business). Alternatively, invite one of their sales guys around for a demo, ask them to show you the top sites in your industry (probably will anyhow).

[Hennatron]

Thanks edit_g - have done.