The biggest thing that RED has lacked, as compared to the Cacheability Engine, was the ability to test not only one URL, but also all of the linked assets on a Web page (if that URL is HTML).
 
RED can do this now, using the 'check links' option under a page's headers (available when the response is HTML):

When you follow this link, RED will request every image, head and frame link on the page and display a table summarising the results;

The results are hopefully self-explanatory, but you can mouse over the headers for details of what the columns mean. The 'Problems' column shows the 'warning' and 'bad' level messages for each asset, and you can either refer to the bottom of the screen or mouse over the numbers for more details.
 
I'm still tweaking the display of the table; there's a lot of information, but I think it's already better than the CE. Feedback appreciated, as always.

RED already has a Twitter feed, but that's mostly for the truly geeky -- mostly, it gets a tweet every time code is committed to the repository.

Like I said, geeky.

I wanted to have a channel to announce new features, fixes and other interesting things in; this is it. Soon I'm looking to get it hooked up so the latest post shows up on RED's front page.

Enjoy!