You can hardly walk through a few pages on the Web these days without bumping into some variety of URL shortener, sharing bookmarklet, or aggregation site that tries to show the most popular data. Bit.ly has become the shortener of choice for Twitter, with StumbleUpon and Digg having their own offerings in sharebar land. A lesser-known alternative is ShareIn.com, which launched a while back, and hasn't had a whole lot of pickup, so far as I can tell. But in looking at the service, I see that ShareIn.com combines the information I've always liked about bit.ly, including statistics, with benefits I've liked on other sites, including individual user history and total share popularity across the network.
ShareIn.com's goal is to make it easy for you to share items you find online with your friends, and it offers three ways to do so - via Twitter, via Facebook, and through e-mail. Like other bookmarklets, you just add the "Share via ShareIn.com" bookmark to your browser, and can share any link from the Web to your connections.