I was playing Doom 1 on my computer the other day, and I noticed that Doom had online play. I thought it would be sweet if rockdoom had online play, or if rockbox in general had online capabilities. I thought for a while, and this is what I came up with...
There can be a plugin in Rockbox that searches for a connection. The connection could be supplied by a small wi-fi atenna that could be plugged into either the headphone jack or the big USB socket in the bottom (or plug in the USB Cable to your ipod, and find an attena with a USB socket? By the way, if there is no such thing, you could try to custom-make it).
Just think about the awesomeness with having an internet-connected ipod/iriver/ect.
Some of the more useless plugins like the text input or rockpaint can be sent to other people. rockdoom can have online play. Competitive high scores in the other games. rockbox could beat the Zune at it's own game by sending music!
It's a long shot that it'll ever happen, but I thought I'd mention it anyway. I wanted to get input from other Rockbox owners to see if it's at all possible