Presumably this is a bad thing. After looking at the people.emich rules, you are given a 50mb limit on your personal site. Nothing bad really happens at this point, but once you reach 55mb, what they call the hard limit, your account is frozen until you delete some content. So what do you do when you reach this limit? Well check out the link they gave me in the above image, substituting my user name for yours. On the next image you see a screen shot from my site, showing the current data usage and highlighting the files that are using the most space.
What you may have noticed is that there a few images that are taking up 8.3% of my space each. Ouch. Well it turns out I didn't need these images anyway. They were the master files that I eventually cropped, resized, and then used on my page. I was able to delete these images and drop way below the qouta. Take a look at the image below and see how deleting a couple of images fixed my issue.
