Finding documentation
Adobe Flex 3 Language Reference, via bytearray.org, via searching Google for flex 3 actionscript Remoting.
I'm not sure why I didn't find this sooner (perhaps I did but didn't bookmark it at the time) but I'm sure this will be a useful resource, since all of the other pages I've found for Flex remoting deal with using MXML -- which I'm trying to avoid, since I'm embedding the remoting calls into FlexUnit tests. :)
Tags: documentation, flex, flexunit, remoting, searches