There's a ton of great advice in this thread already! Me and my classmates have also found the same thing, getting no responses from lots of applications. I've found a great job now though, so my piece of advice to add to this great pile of advice is:

Keep at it! You'll find something! It will take time and it certainly gets depressing to put lots of effort into each application just to get ignored, but it will work out if you do your best and keep at it.