I really need this patch! Is it available for version 0.4.0?

It doesn't seem to be in the standard client (0.4.0) yet. Why not? Sure, advertising it as an anonymity feature might give false expectations, but the same is true for the current client, since Bitcoin already has an anonymity reputation. This feature is not sufficient for complete anonymity, but it is a necessary (IMHO) component of a anonymous set-up, and as such it is a useful addition to the client. Sure, it adds complexity to the user interface (I haven't seen it yet), but this can easily be an 'optional' feature (and disabled by default), can't it?

Besides, I need it for a completely different reason: I want to manage several separated accounts, for an open source software development 'bounty' system (e.g., 'if you want to have this feature, send BTC to that address'). I want others to be able to see how much has been donated so far (or even how much they can receive if they implement the requested feature), so I don't want to accidentally spend bitcoins from the donation address.