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JS/Node : 168 Chars

function n(s){var r=[];s.split('').reduce(function(p,c){if(!isNaN(parseInt(c))){if(isNaN(parseInt(p)))r.push([]);r[r.length-1].push(c);}return c;},'');console.log(r);} 

Beautified version:

function n(s) { var r = []; s.split('').reduce(function (p, c) { if (!isNaN(parseInt(c))) { if (isNaN(parseInt(p))) { r.push([]); } r[r.length - 1].push(c); } return c; }, ''); console.log(r); }