And since Osmocom is becoming the "middleware" for many SDR capable devices,
this might be a good addition.
Osmocom has had a driver for like 1 year ... http://git.osmocom.org/libmirisdr/ and if the lib is found, support will be built in the gr-osmosdr source as well ...
AFAIK one of their big downside is that each RF range has a different input and most dongles only have 1 wired in ... restricting the range a lot. But steve would know better.
Cheers,
Sylvain