Just some suggestions that I would find useful :)

* I can't stand any of the aerial/map layers except when zoomed right in. Can the default be "outline" or, better still, can we have a default preference for logged in users

* Change the way the default option from "visible layers" selection works - just because I've zoomed in doesn't mean I don't want to see less precise records.

* Can we have a "link to this map" - where zoom, location, layers etc. are all remembered.

* Whilst the layers option box in the right hand corner is very slick, it's incredibly confusing. Even now I don't really know where to go to do things.:/