I'm obviously pretty biased (as a partial owner), but I am really excited about this site and it's future. I know dicesites are a dime-a-dozen, but I think bustadice goes a few steps beyond. Things I think are really special:
* Insane coin-selection optimizations, for both privacy and fees. We'll need real data to know exactly how well it works, but in something like 50-85% of the time (in simulations) it can avoid creating change (which is both expensive and extensively to cluster bitcoin transactions). And users will enjoy *by far* the lowest fees of any bitcoin service. This alone was 3 months of solid work.
* An advanced "offsite" investor system, that allows investors to not just leverage but say exactly how much they want to invest without having to risk it all to a counter-party. Most investment schemes don't even offer leverage, but when they do they tend to use something like multipliers (e.g. 5x) which means when you lose, you're under utilizing your money and when you're up you're over-leveraging. The offsite system keeps it perfect all the time.
* A really powerful provably fair system, that gives investors (and everyone) significantly improved guarantees. I tried to create a high level technical overview of how it works: https://gist.github.com/RHavar/285c295f7906e03369cd66580a1b5f45