Hmm.. That's a very good question, Molly!
There's no way to move your bookmarks to the top of the page, however, there is a link up along the top of the page, that says "Dashboard". If you click on that, it will bring up a page that shows a good number of your bookmarks.
I highly suggest removing old bookmarks, because that will allow you to see the ones that are valid to you at this point in time.
It is possible to show more than just the most recent 10 bookmarks as well. That can be found in My Profile -> Preferences. Scroll down to
Portal Style Home Page Settings, and set the number you want next to
Number of Displayed Bookmarks. Scroll to the bottom, and save!