I've got a bazillion apples this year just like I expected (see previous post above).
If you see some on the ground, it's not necessarily a cause for concern... this is known as "June drop" and it happens when the tree decides that it has more apples than it feels like it can support. With June drop, as many as about half or 3/4 of the apples might die and fall off, leaving just a bazillion apples instead of a megakatillion.
Also possible that you have a bug infestation. It's worth a look. I've had aphid problems many times, and this year some kind of beetle ate about half of my Sweet Sixteen apples. Fortunately they are very easy to shake off the tree and it takes several days for them to crawl back up, so I've found if I shake the tree hard every couple days, it hasn't been as big of a problem. I prefer not to spray but I might if it gets worse.