PSP-destroying demo has made you thirsty for more DJ Max, don't fret: the NeoGAF community has written up a guide on how to play a free online version of the game. With their handy guide, you won't need to know Japanese -- all you'll need are ninja-like reflexes to withstand the onslaught of falling notes.
Create a free account here, and then download the game here. (Note: You will need to use Internet Explorer.) Use the NeoGAF guide to help you through the process.