I just saw this when trying to share a post on FMyLife.com (the post was hilarious, and I'd quote it here, but they removed it) when I saw the "share this" button in the corner. I've seen it on other sites but not used it. Upon going back to those sites, they seem nice but the multiple buttons kind of puts me off and reminds me how much consolidation is needed in the social web space. Honestly, somebody needs to pony up some cash and buy out their competitors, integrate their strengths, and becoming powerful. Anyway, so this button is clear, has all the sites, and works quite well! It seems there's one called "AddThis", which is similar but seems less powerful. I'm guessing these have been around for a while, but not so much on the sites I frequent - Ars Technica, the NYT, the WSJ (which has a weirdly limited set), even Lifehacker! I highly suggest any bloggers out there to include this in their site, and for the time being allow easy expression through any medium, until some consolidation occurs.