This message was edited Friday, Aug 16th 12:54 PM
This is Lysimachia nummularia - Creeping Jenny. I'm not quite sure from the picture but it looks very light coloured and could well be the cultivar Aurea - Golden Creeping Jenny
I agree with Baa. You had the two mixed up. Which is not hard to do.
Warning - It spreads! I'd call it invasive, but it is very pretty on right places, like growing down from rock or flowerbed like ours.. but in another place it was growing all over my gentians, edelweiss, antennarias etc.. Dad pulled most of it away and we gave them to my cousin and her new yard in Vantaa :)
Sedum acre for me spreads by reseeding. I like it in confined places, as it looks good in drought conditions with a minimium of watering.