The only thing I haven't liked about the Warners Noir box sets is...the year-long wait until the next one gets released. :) One response in the HTF chat seemed to indicate the possibility that there would be more than one of them released in '06, but I think the wording was not definitive about...
My only suggestion for more upcoming Warners noir box sets would be to cut down on the amount of time we have to wait for them to come out. :) Good to hear that they've already committed to at least two more volumes, although I doubt any of us expected the series to stop any time soon.