So, I hopped to Amazon and order me a cheap 46mm Tiffen ND 0.6 Filter [HERE] that'll fit my 50'Lux, for about only $15. It arrived soon enough and I quickly took some test shots while there were still plenty of daylight out.
One minor problem I noticed is that since the M9 "guesses" the f-stop base on the exposure metering, by adding the ND-filter, it thinks I'm using f/3.4 aperture when it's actually f/1.4! Regardless, I think ND-filters are great little tools that I'll be always packing in the camera bag since they don't take up a lot of space. I just need to remember to use them! Below is a series of shots from our recent trip to Legoland, and it'll show that I remembered to put on the ND-filter mid way through :)