I guess it depends on your workflow. I've been using "Add Star" as a bookmarking service and "Share" as a way quickly Tweet things out. I then mapped "Send To" to Instapaper so I can send longer articles there (2 clicks for Send To vs. Single click for the other two). I've been thinking about a "Send To HN" one, which would be a great addition.

If you read a lot of feeds (According to Google, I have 347 of them), it makes it that much easier.