I did some snooping and I found out that the font I like that is embedded in some library epubs is called Charis SIL. It is not an Adobe font, it is free and was developed by a literacy organization "for laser printers and other less-than-optimal reading conditions."
You can download it here:
http://scripts.sil.org/cms/scripts/p...#FontsDownload
The font is very heavy so you might hate it, but I find it easier on the eyes. Give it a try!