Moxyfire,

re: the PB Blinky7/Superflash -I got the rack mount bracket last week within 2 days for $5 flat. It mounts to either the vertically or horizontally aligned holes. In my experience, most racks have one or the other, the Nashbar rack you linked seems to have both. I love the mount as it gets the light off my seatpost and makes it most visible, but had one issue in that it put the light really close to my rear fender. I lowered the fender a bit since it is one of those crappy PB Freddy Fenders I seem to keep buying, and made it fit well enough to remove easily.

I actually use the Blinky7 year-round. Although the SuperFlash is brighter, I actually like the range of angle visibility that the 7 has better, and they're cheap. Check ebikestop.com for killer prices.

Nice part is that the light snaps in and out of all the mounts (rack, chainstay, seatpost, or arm band) and doubles as a clip. That lets me have a few lights and put the mounts on my trailer, wife's bike, soon-to-ship Xtracycle, etc.