About half of all users should have Twitter’s new lists feature turned on.
It lets you create groups of users to follow and ideally should make the site a lot stickier for new users (or a lot noisier for people who already follow hundreds of accounts). Unfortunately, any of my attempts to follow new lists has brought intermittent fail whales, meaning the system is over capacity and is breaking down.
I created a list here. It’s pretty easy — just find the right Twitter handles, then click on the gray button to the right and scroll down to add them to any list. If you’re a bit more adventurous, try Listorious for curated lists.