IPFS is a new and exciting technology, and a few days ago it had a lot of available nodes, probably because it was linked from some popular website, and so a lot of people decided to try it on that day.
Today there are very few nodes online. (Although more peers might become visible if users try to execute a lot of storage operations.)
For a serious experimental setup, there would have to be a local bootstrapping node, which would probably require a static IP.
The main site is at:
and it has downloads which install very easily.
Juan Benet did a talk about the basics: