I have been reading about n900 losing their microusb ports and it scares me too...
I was thinking if there would be a way we could ask guyss from "Powermat" to create a n900 compatible back cover so that we use the usbport as less as possible..

For those who don't know about this product. /.. its basically wireless charging... you replace your backcover with a new one you get from them and there's a mat and you place your phone over it and it charges your phone...
http://www.powermat.com/us/how-it-works/