The Sony PRS-505 supersedes the PRS-500 and there have been some welcomed changes implemented. On an aesthetic level the 505 offers more choices in case colour. The higher contrast screen is whiter for more comfortable reading and the images can be enjoyed in better quality with 8 versus 4 grey scales. The PRS-505 can connect to all UBS ports and can also charge fully from them. Quicker page turning... [Read more]