Just made a quick release of Flasher with all the NPAPI URL streaming functions implemented using libcURL. Also added a --baseurl argument to help in resolving the relative URLs that most .SWF files use.
If I get a few requests I’ll update Flasher to use a Gtk-based window and mainloop. Gtk is a requirement of the new Flash 9 for Linux beta. Until then I’m happy keeping the dependencies to a minimum by using Xt.