If you are still undecided in the Open XML debate, or decided but want tools to make it easier then hop over to James blog and have a look at Views on Windows Vista : Open XML gets an SDK:

Yesterday Microsoft announced a SDK (Software Development Kit) for SDK which allows developers to create code which works well with the Open XML thanks to the libraries, samples and documentation provided by the SDK.  You can download the SDK here.

If you now think that having this as a standard is a good idea, please go to here to add your vote. 

ttfn

David