Obligatory transaction fee? I'm fairly new to bitcoin and today I sent 1 satoshi to my own adress using the standard wallet, and I was surprised that I couldn't do it without paying a 0.005 BTC (I think, can't remember the exact value) transaction fee.

As far as I knew transaction fee's were supposed to be voluntary, when did this get added? Is there no way to transfer bitcoins for free anymore?
Transaction fees are voluntary but the client application is forcing the minimum transaction amount of .005.  It's been a long time since I've used the standard client.  .005 sounds correct.