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I wonder if they're still going for LISA (> ligo). I guess LIGO wasn't sensitive enough? http://lisa.nasa.gov/

The first gravitational wave detectors weren't sensitive enough; there is a second generation (including a more advanced version of LIGO) that is supposed to come online in the next few years.

In parallel, people are also going forward with development for LISA. It had to be scaled back a bit because NASA decided to pull out, but it's still going.

Just as a reason for doing this in parallel. Space based detectors (such as LISA) are sensitive to a different frequency range than ground based detectors such as LIGO and thus to different of astrophysical phenomena [1]

[1] http://www.ast.cam.ac.uk/~rhc26/sources/

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