Used 2nd Walk Tracker Pro (F7L3MHL9LE9K, after trying #3 and #4), and with "caedeshkan" using #1, all 4 are now gone. Big thanks to whomever contributed these!!!
BTW, KAYAK code is also dead.
And to show my appreciation for this community, here's 2 codes for Instapaper (exp. 28-Aug-12): NJH4NMA66XPJ ARH4AXWMWWAJ