Twitter Misson:Permission
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blog.twitter.com
The biggest change is that third party apps that use xAuth to authenticate have to switch over to OAuth, otherwise they lose the ability to read or write direct messages. I can't help but feel there is another motive to this.
Oh, and the best part? Developers have two weeks to introduce OAuth support (including getting past app review): "We know this will take some time so we are allowing a transition period until the end of this month".
This is obviously a small thing and I don't really mind it not being fixed, but it'd be a pity if DM's break with this update.