Is my Samsung Galaxy Tab using wireless or 3G? I recently got a Galaxy Tab #G from Verizon, but I'm cheap so I only got the 1GB data-plan.

How do I know if the Tab is using the wireless connection I'm connected to, or if it's still trying to use 3G to load data?

Is there a setting, or maybe a free app that I can get to tell me what apps are using what connection?

I haven't explored much on the device itself, so there may be something built-in that I just haven't found yet...
You could just check the logo on the top bar? On the right you have time, battery, signal and either g/3g/h or the wifi logo.

this image (random googled) shows the tab with the wifi logo
while this rather bad (also random google) image shows it with 3g