Nothing. But last night I kegged 10 gallons of a Little Sumpin' Sumpin' clone that had been in carboys for 9 months!
I got into a vicious cycle of "I'll brew/keg next weekend" and hadn't even checked the chest freezer for at least 6 months. It was set at 41 degrees and there were no visible signs of infection, so I decided not to dump it. The uncarbonated samples tasted pretty good, although they may need another round of dry hopping in the keg.
I've purchased a lot of new equipment over the last few weeks and hope to get back in the swing as soon as I get my garage cleaned out and build some shelves to store my brewing equipment. <-- More procrastinating.