I might suggest that you decrease the opacity of the quotation images that serve as the background to your quoted material. While still readable, it may be easier on the eyes of some of your older visitors to have to strain less to distinguish black text from a dark gray image.
The only suggestion I have to offer is that you break up the text of your entries with some whitespace (e.g. paragraphs or even full line breaks between paragraphs). While this is clearly only one person’s opinion, having a solid bock of text can be daunting to a reader.