As time passes by here in the UK, we get word of another app adding Passbook support. This time it's Subway, with an update to their Subcard app that allows you to finally add your card to Passbook on your iPhone. Your Subcard ID and recent transactions can now be accessed from your Passbook wallet.

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The fine folks over at Second Gear have a couple of exciting announcements this week: A new product, and a new service for developers. What makes these announcements particularly interesting is their use of Passbook.

It's still a pretty big deal when iOS apps are released with Passbook support, especially outside of the U.S. Anyone flying down under will be pleased to know that Australian airline, Qantas, has released their brand new iOS app which indeed does have Passbook support.

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Passbook can be an incredibly useful tool for storing all kinds of things from boarding passes to loyalty cards to gift cards and more. Unfortunately, the App Store doesn't make it so easy to find apps that are Passbook compatible. While there is a list, it isn't updated very frequently and misses a lot of hidden gems that ourselves and many of our readers have found over the past few months.

So if you're itching to add more items to your Passbook and find an actual use for it, here are our favorites: