Lulu claim their new "Lulu EPUB Converter" will automatically fix minor errors, such as fonts and spacing.
Lulu also offer a EPUB Creator Guide. Curiously they do not offer this on the web, just downloaded in EPUB, PDF, and Ms Word format. It covers topics such as:
- Settting up your document's EPUB Table of Contents
- Images in your document
- Hyperlinks in your document
- Using Styles in your document
- Troubleshooting Your EPUB Conversion