I just ran across this and gave it a shot on my strat. Even with a Floyd it still made a noticeable difference when I "wobble" a chord. They now sound much more musical where as before as soon as you touched the bar the chord would fall apart.
check it out
http://youtu.be/Iy-F7iSIopA
Wang bar :D
I know next to nothing about trems, but that seems like an interesting concept.