Re: I talked with Amazon Live Support today...

[...]
Alan:
If the payments are irreversible as far as I can see.
Interesting.
The official bitcoin site als says the process is experimental
http://bitcoin.org/
Either way I'll pass on your feedback, if it proves secure and convenient for customers it will be considered in due course.
Can I help with anything else?
Me:
the client is experimental, but the network itself is running and other merchants are using it
nothing else other than bitcoin - although would you be able to get whatever committee it is that you are passing it on to to respond to me after they have looked at it?
[...]

The client is the currency currently. There really are no alternatives to the official client.
The bitcoin.org page clearly says "Bitcoin is an experimental new digital currency [...]". Don't oversell it dude.

I beg to differ. There's a lot of alternatives like the Electrum and Armory present in the Alternative Client subforum.

Neither Electrum nor Armory implement the full Bitcoin protocol. Ie. they don't keep a local copy of the block chain, and help other peers maintain a block chain (which is needed for the Bitcoin network to function). Armory is intended to become a full client (that doesn't depend on the Satoshi client), but isn't yet. Electrum is only intended to be a light weight client, ie. it doesn't support the network in any way, it just uses it. Without the Satoshi client there would be no usable Bitcoin currency at the moment.