As eBooks come in diverse formats (and the list is growing), you may have to use several pieces of software to read them. Some of them can only be read in specific devices. To avoid that it is very convenient to convert your eBooks to a rather universal format like PDF. eBook to PDF is an online service that does that for you, free of cost. It currently supports around 45 formats which include popular eBook formats like epub, cbz, chm, lit, mobi, cbr etc. Quite handy if you do not want to search around for the right software to read a particular eBook.
The original site is down. Alternative service.
[Courtesy: Jester Raiin]