congrats on the new scanner!
I too just got mine about a month ago. While messing with the different settings, I found what worked best for me was the "color magazine" setting instead of the "color photo" and "document" options. I believe I keep it at 200dpi though it goes much higher. It scans quicker, takes up less space, and quicker to post to the net.
Like others have mentioned, I keep the lid up so you get the black background.
Rob