Available for download from this entry on his blog, the IME adds QWERTY, 12 key and 20 key input methods that are far, far superior to the standard QWERTY provided in cupcake! A couple of screenshots for your pleasure...
I've installed the new input method on my device (via ADB) on my rooted, cupcake'd G1 (running Haykuro's 1.5 ADP build) and I love it! I've also actually removed the standard cupcake keyboard to free up a bit of memory.
I'm assuming root privileges are required to install... anyone? I understand a similar keyboard is preinstalled on the Magic, but since my review handset hasn't arrived yet, i'm not sure! Anyone?