Beside its openness, there is also one more reason why ODF is great for everybody who must produce a lot of office documents, one that will be the subjects of many posts on this website: ODF is really simple to generate or edit automatically.
Even if you aren’t a professional programmer, it takes very little effort to put together a script that generates or processes in any way texts, presentations or spreadshets in ODF format. To know why, read Why and how the OpenDocument format can save you a lot of time, and let me know which kind of ODF scripting recipes you would like to see added to the website!