What are the advantages of storing, sharing, and tagging web content this way? What are the disadvantages?

The advantage to using Delicious is being able to share my favourite websites with friends. How cool is that! I had no idea! My friends and I share a common hobby and we spend a fair time looking at other's blogs. This will mean we can easily share those blogs back and forth.

I can't see any disadvantages to using Delicious!