Have you ever found yourself wanting to save your place on a long web page so you could come back to it later and finish reading without having to hunt for the place where you left off? Neither have I, but someone somewhere might have wished for such a capability, at some time. Placemarker was written for that person.
Say you're reading a long article on VanityFair.com - a site that frequently posts excellent articles that are sometimes too long to read in one sitting. What are you supposed to do when you need to interrupt your reading for more than a few minutes? You could just keep the browser tab open, but what if you need to close Safari for some reason? I suppose you could reopen the web page and use the Find command to search for a phrase you remember from where you left off. Sure you could.
Now there's a better way. With Placemarker installed, just select (highlight) a few words at the place where you want to continue reading next time. Then right-click (or Control-click) the selection and choose "Placemark This" in the context menu. Placemarker will create a special "placemark" URL and send it to Instapaper, Read It Later, Pinboard, or Delicious, whichever service you prefer. (You need to have an account with one of these services and be logged in to it, or Placemarker won't work. But you don't need to have the service's web site open at the moment of creating the placemark.)
What is new in this release:
In this release, I've changed the way Placemarker saves placemarks to Read It Later, Pinboard, and Delicious. For these services, Placemarker now saves placemarks using the service's API instead of using bookmarklets.
In the case of Read It Later, I made the change because their bookmarklet was not correctly displaying the progress indicator when loaded from Placemarker. For Pinboard and Delicious, I made the change because I was not happy with the way their bookmarklets opened popup windows, in which you had to click a button to save the placemark.
I wanted to make the same change for Instapaper, but I couldn't because their API (at least the non-oAuth one) for some reason strips hashes from URLs when saving them. (A hash is the part of the URL following a # character.)