Nearest Ive ever got close to using ultra "ultra light" lures like this is flys and 2" rubber "Mr Twister" worms for perch.Used these when fishing the small tributary of the Saone that flowed behind my caravan when living in France.It was great fun,so much so that I nearly brought a rod specially for it.I used a light fly rod (8'AFTM 5) but with a small fixed spool.
If they were used more I suppose we would all be suprised at what we could catch on them.After all look at the coarse fish that can be taken on fly or are caught accidently on small live or dead baits intended for eels.
At the present in the UK the nearest we see to this is anglers using "ultra light" lures and outfits for the likes of chub but compared to the lures you show they are quite heavy still.
Newt, ever used the Northland "Whistler" jig head from Cabelas? found these good for our Perch.
Peter I think the US's version of Ann Summers is Victorias Secrets.Mmuch the same but without the vast amount of strange vibrating lure blanks..................or so Ive been told