We present five serendipitous spectroscopic interacting Lyman break galaxy (LBG) pairs and six candidate pairs from our z 3 Keck survey. All galaxies in the pairs exhibit Lyα in emission and we show that this is not a selection effect. A complete investigation of all LBG spectroscopic-photometric pairs with at least one spectroscopically confirmed component indicates an abundance of Lyα emitting LBGs (eLBGs) with projected separations of < 50 h-1 kpc, physical, with eLBGs comprising all pairs with < 20 h-1 kpc separations. We present a new broadband technique able to select very large numbers of LBGs based on their Lyα EW and associated features. We successfully test this technique with CFHTLS Deep data and 200 Keck spectra and show that the Lyα emitter (LAE) population is a natural extension of the LBG population. As a result, this technique can efficiently select very large numbers of LAEs over large defined redshift paths using simple broadband criteria. In addition, we present evidence that a significant fraction of LAEs and eLBGs are detectable as a result of the effects of interactions, whereas LBGs exhibiting Lyα in absorption are not.