New Babbage is one of the excellent Steampunk builds in Second Life, and arguably the best known that is exclusively Steampunk. This promotional video from AE Cleanslate is very well done, with a highly professional audio track, and gives the viewer an excellent introduction to the genre and what can be accomplished in Second Life.
I particularly like the monochromatic color usage -- it gives the machinima much more realism than if a multi-color palette was used.
In 2009, I did a still video of New Babbage and set it to the music of Parry's Jerusalem, the National Hymn of England. It has had over 1000 hits since that time, and remains one of my favorites. I show it below as a comparison.