Magically displaying an RSS feed
Well, maybe not magic. Javascript.
Here’s a scenario: you want to show a list of recent tweets, blog posts, news items, or anything else with an RSS feed on your website. But your CMS won’t let you, or your templates can’t easily let you slip in a suitable widget.
Enter Feed2JS. This service lets you specify an RSS feed, and customise a piece of javascript to control how it is displayed - the number of items, whether to show titles, descriptions or both, date published - all the usual stuff (but more control than the normal Wordpress widget gives you, for example).
You can preview your script as you go, and then when you’re ready, just cut and paste it into your site (you’re allowed to paste Javascript into pages on your CMS, right?). You can style up the content of course, so it fits in seamlessly.

You can see this in action over here (see the latest updates box, which runs off an RSS feed of posts in a specific Wordpress category).
It’s a life saver for those little jobs where it’s nice to feature some dynamically-changing content but you’re working to some technical and time constraints. Hurrah for Feed2JS.