Great tip on saving pesto

So my room mate and I made pesto again this weekend and she had a great tip.  Unfortunately pesto doesn't last long in the fridge.  If you make a batch and are single or if you'd like to save money and make a bulk batch, pour the extra pesto into an ice cube mold.  After you've filled the tray cover each cube with olive oil so it stays fresh.  Place in freezer.  Now, if you want a single (or multiple) serving(s) you can pop out one (or many) cube(s) of pesto and place over a single (or multiple) serving(s) of pasta.