Having just battled away on CQL Filters, I am writing this in hope it 
saves someone some time.

1/ Remember to ensure the filter is properly escaped.
2/ Spatial filters work in native SRS only. Convert all geometry to 
native SRS. The SRS parameter is honoured in the output GML however.
3/ Geoserver (9 june 2011) ignores the distanceUnits parameter. The 
distance should be in the native SRS units.
4/ If the native SRS is lat/long, then geometry must be expressed in lat 
long ordering not x,y ordering. See
http://docs.geoserver.org/latest/en/user/services/wfs/basics.html#axis-ordering 
for more detail.

I hope this saves someone some time.

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