It's like Mag-Safe for music!

ZZYZX (Wow. Great name, guys...) has created a magnetic break-away plug and cable set to replace your standard 1/4" guitar cable. I've bought two so far, and they work as advertised. The magnets are strong, and the noise suppression is lovely. The only caveat is that they do work as advertised, so if you are used to stepping on or tripping over your cables, you may come unplugged mid-shred. Maybe these should come in different strengths, like ski bindings...

Buy them here or here.