Sony Ericsson W810

Is there a way to create multiple bookmarks in various mp3 files to later pick up exactly where I left from and continue on? I listen to 1+ hr long files such as audio books and it is a major pain to find where I was.
On a related issue, scrolling through the mp3 file is also very slow. For 2-3 minute music files it might be just fine but try going to the middle of a 1 hr file and it takes forever. Is there a faster way of scrolling through the length of a single file?

Thanks much