I forget who, someone on this forum confirmed wireless routers as messing with them. This was for a medtronic ICD, if I recall correctly. The OEM said they were looking into reports of this issue.
I'm not sure on the others, but I do know there was a recent study on Ipod earphones - research showed the magnets in them were powerful enough to interfere with pm/icd's.
I'll try and find the article tomorrow and post it [it's on my icd support group forum]