This is obviously very needed. See my comments about ODataResult on how this should be intelligently implemented without using things like ODataResult.
Comments: I just checked in a sample code to http://aspnet.codeplex.com/SourceControl/changeset/13217b5b4cf1 The sample is using 0117's nightly build. It demonstrates all the basic operations on odata service. Although it doesn't provide sample specifically for inlinecount. You should be able to do that by requesting GET http://localhost:50231/Products?$inlinecount=allpages
Comments: I just checked in a sample code to http://aspnet.codeplex.com/SourceControl/changeset/13217b5b4cf1 The sample is using 0117's nightly build. It demonstrates all the basic operations on odata service. Although it doesn't provide sample specifically for inlinecount. You should be able to do that by requesting GET http://localhost:50231/Products?$inlinecount=allpages