Inspired by the whole problem of the USB port becoming loose on the N900 I started to mod my N900 “a little bit”. Essentially, I added a Powermat receiver to the back of my N900 such that it can now be charged wirelessly. The pictures give some impressions of the brute force applied. Not necessary to mention that this for sure voids any warranty. Furthermore, if you do something similar you do this all at your very own responsibility and risk. Please see also the other disclaimers in the talk.maemo.org thread: http://talk.maemo.org/showthread.php?t=72753
Above pictures show the first version of this mod. I am currently using the third(?) version of this mod.