Acorn 4.5 is out, so start your update engines and grab the new bits.
There's nothing earth shattering about this release, but I'm irrationally proud of it and I think it basically comes down to two new things in it that I really like.
The selection marquee has been tweaked a bit, and rotates through various colors and draws smoother making it 200% more awesome. I love it.
The other one is when you paste in dimensions such as "1256x408" into the width field of the new image window, Acorn will recognize that you probably want an image with a height of 408, and will automatically set that value for you. It's a small time saver, but it makes using Acorn even more pleasant.
There's lots of other stuff in Acorn 4.5, including detailed release notes.