Re: Is there a app that displays Network Data Usage?
 

Homescreen++ does this along with a lot of other stuff and it's free.
It's basically a today plugin but you can set it up to do alot of stuff.
You can get it at www.chi-tai.info :)

Re: Is there a app that displays Network Data Usage?
 

i use and vote for spb wireless monitor 3
send me a pm if you need any help setting it up (if you decide you want to go that way)
its really good and easy