You should probably be marketing to two types day traders and finance/VC's with more capital.
For day traders, you would find out what the 4/5 most popular trading forums are. Make a post that outlines what X is and what it's advantages are and ask for feedback. We should get a good idea from that how likely they are to start trading once it becomes fairly functional. (You could also try to incentivise 'hero members' on their forum to try download and use it, if they like it they'll promote it and if not you will get some very valuable feedback)
The marketing director for DAC's unlimited should be presenting to more high profile people, so giving a presentation/phone call to secondmarket for example with a follow up. You could also contact people who were bidders for Bitcoin that were recently auctioned. You only need a handful of these people to get the potential.
THis is where I was headed the other night when trying to type on my phone. There are tons of trading forums etc. In fact when I get around to setting up a delegate this would be my one and only goal.
I might even suggest we support some fork that is basically play money. Don't you see these things on forex markets etc? They're likely rigged in the customer's favor by having 0 spread etc, but... I know they exist.
Fantastic. We could also maybe do a promotion where we give people that have more than 100 posts a little BTSX to try the system.
I tried day trading myself a few years back, and I actually think the BTSX wallet is easier and more intuitive than some of the trading software I downloaded back then, with a few more weeks developments, I suspect the average day trader will be very comfortable setting it up and getting started with some clear instructions.
I also agree with Gingerbreadman, part of the challenge may actually be taking them through the process of acquiring BTC and then exchanging it for BTSX to fund the wallet in the first place...