I got a 10W (or maybe it's 15W) from Planet Bike and I LOVE it... except I can't find it. Somewhere in the layers of life, I HOPE, but it's rechargeable battery was doing fine (until a month ago when it disappeared) for the commute.
Now I'm just using one of those Cateye's with the 5 round LED thingies in the front... and I am amazed at how quickly and thoroughly I've adapted to that much light. I also have some hokey-spokes ( www.hokeyspokes.com ) which sometimes (but not that often) get cheers and comments, but strangely enough, I *have* been pulled out on from driveways more often with them spinning around in my spokes. I wonder if there's a perception problem - that with just the little lights, they know it's a bike but have no idea how fast I'm going (with the big light, they have no blooming idea what I am) ... with the hokey spokes they *think* they can tell. Or, it's just that those two yahoos were out those two nights. (No harm done either time; I could avoid 'em because there wasn't enough other traffic.)
The thing I am totally, utterly lusthing after now (freudian typo, I'm drooling so much I can't even say lusting ) is a Free Radical so that I *can* take the trainer (and bike) to the group indoor training rides, and I *could* pick up that microwave Amy's giving me tomorrow. ( www.xtracycle.com - and since I've just saved a hundred bucks on a microwave, I reckon I'm that much closer... )

I also have a reallite (or is it a reellight?) that's an oversized rear blinker, but it doesn't fit on the red bike so I use regular blinkies.

The other thing I added was a red blinker light on the left handlebar that I use for a turn signal. Not sure if it helps or not but I think so.