Tracks in Time at West Yorkshire Archive Service

If your roots reach back to Leeds in West Yorkshire, and you like free, you'll want to know about Tracks in Time.  The West Yorkshire Archive Service. is working to conserve, capture digitally and provide online access to the historic tithe maps of the modern Leeds Metropolitan District.
There are many capabilities including searching the apportionment data for ancestors and other people who lived and worked in Leeds in the mid-nineteenth century.

Start at http://www.tracksintime.wyjs.org.uk/index.htm

Also find out more about advances in cataloguing at West Yorkshire Archive Service through their Catablogue.

Thanks to Jane MacNamara for the tip.