There is a more recent blog post with links to ebook fanfic here.
I’ve uploaded “The Sorting of Suzie Sefton” in Kindle (mobi) format, bringing the number of fics available as ebooks to eight. All of these mobi-formatted stories are easily converted to ePub using calibre.
They are all available for download from the Our Mirror of Erised Yahoo! Group Files area in the “MMADfan’s Fanfic” folder (subfolder “RaMverse Fics in MOBI format”). It’s easy to sign-up for the group and have access to these and many other HP fanfics in other formats (rtf, doc, etc.).
Stories currently included as Kindle ebooks:
Resolving a Misunderstanding
“The Unsentimental Arithmancer”
“An Unexpected Shower”
A Holiday with the Headmaster
An Act of Love
“The Sorting of Suzie Sefton”