Copying domain (and only domain) between Esri geodatabases?
For coded value domains, I'll do a Domain To Table from the source geodatabase and then do a Table To Domain into the new geodatabase.
I don't know of a way to this for the range domains. You can do a Domain To Table, but the Table To Domain always comes in as a coded value domain.
http://arcscripts.esri.com/details.asp?dbid=14729
This is an ArcCatalog Extension that allows you to copy domains between geodatabases.
I believe it is only up to date for 9.3.1 SP1, so it may not work with ArcGIS 10.
This method is more hacky and only practical for 1 or a few domains.
In the original geodatabase, create a dummy featureclass with a dummy field that matches the field data type of the domain that you wish to copy.
Copy/Paste the dummy featureclass into the new geodatabase and don't delete it until you've assigned the domain to a field in another featureclass.