Universalis did a fantastic job. I'm sure the modern Liturgy of the Hours isn't everyone's cup of tea here. Nevertheless I believe this download is well worth the price you'll pay. You can even download the Universalis software and use it for a month free. The transfer to the *.mobi format is built in to the program. After that all you need to do is drag and drop the file onto your Kindle from your PC or Mac.
For those who want the traditional Divine Office (as I would) there is unfortunately no on-Kindle option that I know of right now except PDF copies which are tedious to navigate. The only other thing you could do is use the experimental browser to view the mobile Divinum Officium site (which I have done, and it works well too) but you'll need an internet connection for that. I went cheap and bought the Wi-Fi only version. So, having the Office on-Kindle in .mobi is best for me.