I'm assuming it's already on the old list, but I haven't seen Github (
http://github.com) listed -- for us, Github is
the application we use.
I also haven't seen Mixpanel (http://mixpanel.com), but I see a lot of Intercom. Now that Mixpanel has "Engage" (which seems like an Intercom-like thing), is there a compelling reason to use Intercom alongside Mixpanel, or are they mostly overlap?
Another platform I see missing is dotcloud (http://dotcloud.com), which I don't use for everything, but definitely enjoy one-click, hot standby, fault tolerant (well, as tolerant as it can be) MySQL databases.
Last thing we use that I haven't seen listed is Amazon SES (email). I love the no-commitment pricing and paying for what we actually use instead of having to pay a minimum fee and all that.
Also shoutouts for Stripe and Trello.