Electric "shocks" revisited

hola a todos,
after reading a couple of posts related to the "case electric shock" problem, i would like to add my own experiences and questions related to that.
to begin with, i have just switched to my first mac and am so far quite amazed with this machine. however, i've also been experiencing this electric shock/tingling sensation that other people have described. since i'm new to the macbook/powerbook etc world i would like to know if this is a) normal (have read posts of other people saying that all alu-case laptops had similar issues) or b) faulty machine or c) related to my house's wirings.
i have made these observations:
- the tingling sensation is most noticable when touching the edges of the macbook with my forearms while writing (like now).
- it only occurs when my feet touch the ground (a bit weird, but reckon it makes sense if it's a grounding issue)
- it also occurs on battery power only as long as there is any plugged-in external device (printer/external hd..) connected to either FW or USB
- my macbook is plugged in with the so-called three-prong cable, and all external devices are also connected with grounded power plugs
i hope anybody can give a few useful hints or other experiences with this.
thanks a lot
macbook pro, 2 ghz, 1024 mb ram Mac OS X (10.4.6)

What your feeling is a result of the electric potential between your machine and another source of power flow through your body (such as through your shoes on the ground, etc) -- This is not normal, and I recommend that you find the source of the problem before you hurt yourself or damage your equipment.
Try to unplug all of the other equipment connected in that area, and see if you still have the issue. If you don't, turn on one device at a time until you've located the offending equipment. You may notice that the position you're in, including the type of shoes (don't take them off while you're investigating this issue!) you are wearing may have an effect.
The best (and safest) way to resolve this issue is to ask an electrician. You may have unproperly grounded outlets, faulty electronic devices, and its not something to mess around with.
Golan.

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When I first started using my white 32GB iphone 4 a month ago, I felt very slight electric shocks and static-like feeling and a kind of pins and needles feeling in my hands. I soon either forgot about it or got used to it.
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I'll call the nearest store to see if they will let me test other phones out.
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One time I walked across a wet carpet because of a flood, touched a computer keyboard, and fried the computer with my static electricity.
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