I will report on continuing efforts to identify strongly-lensed background sources behind nearby massive elliptical galaxies, and the exploitation of such systems to constrain the stellar Initial Mass Function (IMF). I will summarise results from the SNELLS survey conducted with SINFONI at the VLT, and new implementations of the IFU lens-search method on other facilities. Using new spectroscopy from Magellan and VLT, I will present updated comparisons between lensing, dynamical and spectroscopic M/L constraints for the first three SNELLS lenses, and discuss implications for the ongoing debate over IMF variation in massive ellipticals.