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My understanding is that Amazon bought Mobipocket several years ago - that's one of the reasons (if not the only reason) that Amazon uses the MOBI format. Initially, Amazon used Mobipocket as the route for authors/publishers to publish books for the Kindle. At that time, ebooks published via Mobipocket would go up on the Mobipocket online store as well as the Kindle store on Amazon.com. Then, around September 2009 (I think) Amazon launched Digital Text Platform (DTP), it's direct Kindle publishing interface (recently renamed Kindle Direct Publishing (KDP)). Around December 2009, Mobipocket stopped accepting new publishing accounts. There are still publishers using the Mobipocket eBookbase interface to publish MOBI ebooks, but mostly, I'd imagine, as a route to publishing their ebooks in the Amazon Kindle bookstore, and I'd also suspect that the number of publishers using eBookbase to publish ebooks is slowly decreasing as they transfer to publishing directly with Amazon. It wouldn't surprise me at all if Mobipocket ceased to exist as a separate online presence in a year or so.
Apart from Amazon and a few relatively small outlets, most ebook publishers and retailers concentrate on the EPUB format, so while it could certainly be useful to have the Mobipocket Reader installed for reading any DRM-free (or Mobipocket DRM'd) MOBI ebooks you come across, I'd suggest that regarding Mobipocket, the online shop, as a primary source of ebooks is not likely to be the best idea, and certainly not one that is likely to provide access to a decent range of ebooks. Much better to get the Kindle app for your Blackberry and buy from Amazon.
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