[anurag]

Mobipocket isn't completely out yet, but the percentage does seem to be decreasing. Digging into the Inkmesh DB, here's what I found:

Of all the books for sale on BoB, around 32,000 ebooks were published this year (and had a valid publication date). Of these, around 6k, or 20% were available in Mobipocket (all with Overdrive DRM).

Of these, around 12k were published after June 2009, and around 2k (or 16%) are available in mobi.

Of these, around 3.3k were published in October or later, and only around 350 (or 10%) are available in mobi.