Are you sure you mean the status bar in an Internet Explorer window? The bar at the bottom where it shows which web page address is loading?
If so, I have never been able to resize it.
Mark
I'm using XP Professional and from time to time I cant resize the status bar ie. make it taller. It seems to be OK for a while then I cant do it. Normally I put the mouse cursor on the top line and when I see the arrows I can make the bar higher or lower, Any ideas?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic