I just noticed that the ACM Digital Library have started to prominently display “Bibliometrics” for each of its articles. Currently, we get the number of downloads in the last 6 weeks and last 12 months, as well as the number of citations. The last of which was available before, but you had to go further down into the page.
In case you want a quick link to see, here is Bob Tarjan’s classic Efficiency of a Good But Not Linear Set Union Algorithm.