== Why Ext? ==
I thought you said you wanted to standardise a single library!?

Right...that's the basic idea, however there is a good reason for supplementing jQuery with Ext:
 * GIS

The !OpenLayers library is the core of our GIS functionality & it's developer community are embracing Ext for providing enhanced UI widgets:
 * !GeoExt: http://geoext.org
 * !MapFish: http://mapfish.org
 * HSLayers: http://les-ejk.cz/2008/12/hslayersmapfish-and-others/

JQueryUI just isn't functional enough of a base yet to build such functionality:
 * No Layout, Grid, Toolbar
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