Interesting article about Harlequin Mills and Boon UK and ebooks today, with this to say about Spice:

Mills & Boon's 'Spice' category, a more explicit genre of erotic fiction, is selling particularly well through internet downloads for devices such as Amazon's Kindle and the Sony Reader.

Interesting stuff! Read the full article here: "Mills & Boon boom sparked by young fans in rush to download romances."