I read this blog post where the author lists 24 potential hacker threats to the BTC network.
http://www.quora.com/How-can-Bitcoin-be-hacked There might be many incentives for powerful entities to realize such hacks against BTC. In fact, I would consider it one of, if not the most likely event that could harm BTC and thereby potentially all crypto/e-currencies (in the short run).

Thoughts from the community on this?

/O-man