Would bitcoin be compromised if the officially distributed executable was? From the official Bitcoin FAQ:

Could miners collude to give themselves money or to fundamentally change the nature of Bitcoin?
... Bitcoin is a distributed network, so any changes implemented to the
system must be accepted by all users. Someone trying to change the way
Bitcoins are generated would have to convince every user to download
and use their software

If somebody hacked bitcoin.org, couldn't they send out an update to the Bitcoin protocol/client that contained malicious &quot;steal all your money&quot; code?
Since the update came from official sources, everyone running bitcoin would see this as a regular and standard update, when it actually was malware.
No, Bitcoin would not be compromised, only individual users who downloaded the malware. 

For Bitcoin itself to be compromised more than half of all its users needs to be affected, and that is virtually impossible (given it has no auto-update functionality).

So any tampering with the binaries/source will be discovered long before that it can become a problem.