rtmpdump can be combined/integrated with
Replay Media Catcher. but it is a challenge to make it work smoothly because the command for rtmpdump is extremely long (a long line, a single command) and RMC4 has problems handling such etc ...
it is more convenient to use GUI downloaders which are entirely based on rtmpdump, for example blader.exe (
CJB).
StreamTransport works too with myspace but i am not sure it ST is based on rtmpdump.