Wide Color Gamut
I'm starting to experiment with sharing my photos on the web using a wider color gamut. I've always uses sRGB in my Lightroom export presets because I could guarantee it will always look the same across all the browsers. Now that all the current browsers have advanced color management where they will read the color profiles out of the files (rather than just down-sample all of them to sRGB with sometimes off-putting outcomes) it's pretty safe.
I still contend that most people, even season photographers can't tell the difference unless they are compared side-by-side on a wide-gamut monitor. I digress :)