By using 200 PS3 systems linked together, researchers were able to do the math that helped them decrypt the MD5 hash that's used by Verisign. The researchers would be able to mimic online retail sites, potentially stealing tons of valuable information from consumers. It appears researchers want the hash to be replaced by a more potent one.
It's unrealistic to expect hackers will be able to replicate the results of these researchers any time soon. Getting 200 PS3s linked to each other can be quite a pricey feat! Of course, when you're stealing all of the internet's credit card info, you might be able to afford buying a few hundred PS3s.