**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);
 }