Here's the new features for 2.50, just realeased today (October 15)

It doesn't actually mention the screen capture there as far as I can see.
Am I just being blind? Could somebody bold it please?

Also, how do you use the feature?

You cannot use the feature right now, it has to be supported by each game individually as the trophy system for instance.

2.51 came out today, but it is mainly for Demo units

I'm a little slow but here's 2.53

    New for 2.53

• The full-screen mode setting in Adobe® Flash® Player is now supported in the Internet Browser.*
• Live movie (using RTMP format) playability.*

This thread should be sticky'd.

Here's version 2.70

Stickied because I think this is a great thread.

I wonder what other things 2.7 have brought. It hasn't exactly been overwhelming, and we usually see smaller details about the FW update coming in later.

This is also included in the 2.70 update:

You can now select an option to reduce the difference in volum level between tracks to help avoid sudden, loud output. You can set this option in [Settings] > [Music Settings] > [Dynamic Normilizer].

You can now copy and paste text. You can copy text from the internet browser and paste it into the text entry field of the on-screen keyboard to make it easier to enter text.

Using the internet, you can now search for the latest information about the games that you own. To use this feature, select the icon for the game, and then select [Internet Search] from the options menu. (Pretty interesting new feature)

Also your friends profile loads up much faster.