Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8B117 Safari/6531.22.7)
A lot of then can be removed by holding command and dragging them off the bar.
Edit: for some reason, whenever I post something here and I'm not at a computer to test it, I doubt my response, so I'm 90% sure this is how you do it for most 3rd party icons. I may be wrong with the command key part