Resolved Air card usage tracking

Is there a utility out there that would allow me to track the # of GBs I am downloading in a period. Like most, my air card limits me to 5 GBs per month, and I don't want to go over that if possible because of the cost involved.
I thought I've seen free utilities that will do that in the background but don't know where I saw it.
If someone can help I'll be very appreciative as always.
I use Win XP pro.
Floyd

 

thanks Air, I think it'll work.
floyd

 

Arie, I like it but the meter takes up a quite a bit of real estate on the screen.
I found another one called ShaPlus which while not as thorough, is smaller and may do enough for me. It all depends on how much info I think I need.
Thank you.
Floyd