Originally Posted by JSWolf
Why not also add LRF support besides just Sony sized PDF?
Mostly because LRF is strictly limited to the Sony Reader 500/505.
Plus the fact that the Sony Reader will have DE support in the future, and we already have epub support, which will be much more flexible than LRF.
PDF is still the best way to get correct formatting on a mobile reader, as long as you configure the right settings for your taste, the experience is great.
Adding Mobipocket support does feel like a step backward too, it's based on OEB, an old standard (1999) compared to epub (2007), with less features. But the fact that the Kindle strictly use Mobipocket and that Mobipocket Reader is available for PDA/smartphones too makes this format an interesting choice.
As long as the browsing on the Kindle is free, a full service creating Mobipocket files out of RSS feeds could be very attractive for most Kindle owners. Feedbooks isn't limited to a few feeds, and unlike the blogs on Whispernet, it's free.