If you like SDR, you should definitely have a look at GNU Radio Companion (GRC) [1]. A nice introduction into the methods of GRC is given by Michael Ossmann [2], which is really worth checking out.
[1] http://gnuradio.org/redmine/projects/gnuradio/wiki/GNURadioC... [2] http://greatscottgadgets.com/sdr/1/