It doesn't appear that they will be branching out to Android apps anytime soon. A web solution is an interesting prospect but I don't recall reading anything on the forums about this except for "that's something to look into in the future..."
Perhaps you can try
http://www.nozbe.com/
My boss like to use Asana for team management:
http://www.asana.com/
Here is a better web page for GTD online:
http://regulargeek.com/2011/07/25/13...dows-or-linux/