Right now, we are just calculating random hashes, simply because it's difficult to do so, and money is supposed to be hard to make.

The last few weeks the Bitcoin network has been seeing a slight decline in size from the near 900Ghash/sec peak on March 6th. Some people think that was because of bot-nets joining, or some big supercomputer (it then fell to around 500Ghash/sec). If that was the case, then we may be experiencing the negative effects of a sudden injection of BTC (inflation) in this latest price decline that some took the liberty of labeling a "bubble" [but then, it should only be 5000-10000BTC; a few days of market volume].

Network size is making a U now and appears to be starting to go up again.

There should be more people interested in BTC soon.