Thanks for posting this, if I can ever be arsed to reinstall Fallout 3 I might give it a go. Not sure about the street lights though, they look all weird and solid, and I thought we weren't supposed to have electricity through the streets of DC anyway. Edit: I had a look at a Youtube video of the ENB you linked to, and one of the comparison segments in there does seem to suggest that it's the ENB that's giving the light shafts such a high-contrast, solid appearance.
Oh, and if you're getting tired of the vanilla Fallout 3 soundtrack you could try and complement those visuals with some nice S.T.A.L.K.E.R. ambient instead. I felt it changed the mood of the game quite a bit, your mileage may vary, but after playing for so long I was rather tired of the original tracklist.