What's a good tool for creating .epub format e-books?

I have seen a question here about reading .epub but I would like to create my own easily from a GUI, what is available for Ubuntu? Even if I have to download something outside the repository, as long as it installs easily and works well, I would also like the software to be able to support the use of .svg images and tables.

Solution 1:

Try Sigil, from here; http://code.google.com/p/sigil/

This is an excellent program for creating .epub files, works almost like a word processor

After a lot of frustration with other applications I can say this one works, has good support for .svg images and tables just code your tables as xhtml, it can easily import an existing .epub too.

Solution 2:

Have you tried Calibre?

I'm not sure about the images, but I know that it converts formats very well, and as a bonus, works with my Nook.