Below is a link to an article giving sound advice to authors on royalties and rights regarding e books. Anyone who is about to negotiate a contract with a publisher, (or thinking of doing so in the near future) which includes digital rights would be advised to check this out.
The Society of Authors also provides free advice to its members.
New guidance on ebooks published in the latest issue of The Author:
"Members will be aware that sales of ebooks in the UK are said to be increasing rapidly, although they still account for only a small proportion of publishers’ turnover. The launch of Amazon’s Kindle, already the dominant ebook reader in the USA, is expected to expand the market considerably.