I voted for MOBI, ePUB, eReader, LIT, PDF and HTML (other).
Right now MOBI and eReader support the most platforms. Once Amazon releases Kindle for BlackBerry's both Mobi and eReader will be on par.
ePUB is a growing standard and soon will catch up to the potential client base MOBI/eReader have.
PDF is still the defacto eBook standard and holds 50% of the market share. While your sales of PDF have diminished you don't know what the future holds and you might see PDF sales come back.
HTML is by far the most portable format and easiest to convert.
LIT easy to convert and is the only format that has TTS built into the reader. Since this is a Microsoft product they have accessibility tied into their platform making it easier for the visually impaired to read/listen to your books.
One suggestion I have is to sell your book allow a user to select multiple formats not just one.
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