Agreed Corey, as I implemented the tags I did it the way it like it, a la del.icio.us, if enough people prefer commas then it's an easy enough switch, but I like the non-notes specific space separator.
One thing bad about using the space as a separator is the fact that you can't have multi word tags. That's always bothered me on del.icio.us. I can't stand camelcased words.
del.icio.us has never been user friendly. just because something is a "norm" somewhere does not mean it is good. People search for phrases, not camelcase, no?