The iMac 20" doesn't have a VESA-type mounting bracket on the back (the 24" one does). If you're brave and have the white plastic model, you can try [adapting an old iMac G5 mount kit|http://www.wikiela.com/wiki/How
to_wall_mount_a_Core_2_Duo_Intel_iMac_20_or17].
For other models, you can use the VESA adapter from [www.imacmount.com]. These are adapters that clamp a VESA-style mount bracket to the aluminum pedestal stand for the iMac. You can then attach the iMac (pedestal and all) to any VESA-compatible mount. Here's a picture of an 20" white iMac fastened to a wall using this method (same works for newer aluminum iMacs and the white 17" ones too):
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How to wall mount imac 20 inch intel? Any body has tried
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