Immersion pondering rumble for DS/PSP?

Our handheld consoles can do anything, they can play games (naturally) they can play movies, they can play music, store photos, browse the internet and run homebrew applications. But there is one thing they can't do and that's rumble.

Of course you could always try playing one of your favourite games while sitting on the back of a JCB but Immersion, the company behind the rumbling features in most consoles including the PS3, has recently expressed a desire to supply a more elegant solution.