There is a shortage of tools. The most basic is oeb2epub, which would allow many of the MOBI ebooks uploaded here to be easily converted to ePub (since they are OEBs before they are MOBIs). MishaS's version of oeb2epub does not create a toc.ncx file, and so has no TOC in Adobe Digital Editions. There does not seem to be a way to upload an OEB file to Feedbooks, so the web-based approach is also out for now.
Calibre will probably soon have an oeb2epub, and that may be the first easy way to create ePubs. They will actually be OEB compatible ePubs, i.e. using a subset of ePubs capabilities. It would be relatively easy, though, to add a CSS file to give a "house style" to your ePub ebooks.
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