if you are referring to the "portable document format" as in adobe type pdf's then i am going to make a scandelous suggestion.... get an ipod touch.. i have a 770 (on ebay for sale) a n810 and now an ipod touch... for reading the touch is far superior than my n810 the touch does not do as much and is not as versitile as the n810- but for just reading the touch is best in my opinion.