This new device, called the "Intelligent Dosing Ring" (IDR) easily snaps-on to your portafilter basket to make doing less of a mess. This is particularly useful with a doserless grinder, when trying to direct the grinder output into your portafilter.
It's basically a mini-funnel that clamps onto your portafilter basket (see photos).
Once you've filled the portafilter with the correct dose, give it a knock on the table to level the grounds, then remove the IDR, and you're ready to tamp.
You'll find that it's much less of a mess (and less wasted coffee) using the IDR.