You could build it yourself with the Palm Touchstone and a backcover of the Palm Pre.
There are some success stories and pictures here:
SK17i (English): blog.chupasweb.net/archives/502
SK17i (German Tutorial): android-hilfe.de/root-hacking-modding-fuer-sony-ericsson-xperia-mini-mini-pro/275413-howto-wireless-laden-ueber-induktion-finished.html#post3712719
ST15I (German, my adaption of the idea): android-hilfe.de/root-hacking-modding-fuer-sony-ericsson-xperia-mini-mini-pro/275413-howto-wireless-laden-ueber-induktion-finished-2.html#post3792078
I can't ensure that the testpoints are the right ones, but currently it's working great and charges the battery with around 400mA. For an empty battery it takes 2-3 hours to full charge.
Sorry for not providing clickable links, but I'm not allowed to post links yet.