Another one in the "I haven't tried this yet, but I plan to" category: MacLife reports that the buzz you may sometimes hear in your external speakers when they're too near (i.e., three or four feet) from your GSM cellphone can be tamed by attaching a small hunk of iron to your speaker cables. Many USB cables have a small, cylindrical ferrite bead (which acts as a passive damper on the cable) on them to prevent frequency noise in the cables. Apparently you can either cannibalize the beads from old USB cables or purchase them directly to attach to your own speaker cables.

I'm hoping that this trick can also be adapted to recording equipment, since that GSM buzz is also picked up by either the mic cables or the speaker cables and effectively trashes a recording.

Update: Or, there's the Red Bull iPhone Anti-Radio Interference Shield.

[via Lifehacker]