If you need an INLINE table of contents (i.e an xhtml file containing links to your chapters, sections, etc.) you can make one based on the toc.ncx file and add it to the book in Sigil. Search Mobileread (epub or mobi forums, I think) for two ways to generate a toc.xhtml from the toc.ncx, one using a perl script, and the other using nothing more than a text editor that supports regex search and replace.
IIRC you can also coax Calibre into preparing one by performing an epub-to-epub conversion.
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