Pretty much the only filtering I'll do is if I come to an intersection where I'm taking a right turn, I've been known to use the space between the cars ahead of me and the curb to make my turn before the light turns green. To my knowledge I've never had a negative reaction.
As to filtering to the front of the line, I wouldn't do it. It's not legal, motorists won't expect it, and moreover, they generally won't be happy about it. Do as Sandman recommends and stay in your space, keep an escape route open, bike in gear, and watch your mirrors.
I've also mounted an auxiliary high brake light on the back of my bike in hopes of reducing the chances of being rear-ended.