Newbie needs help with Pink Sifrized theme

First of all, this theme rocks! I am having problems though with the display. The sidebar keeps moving when posts are added. For instance if I have 3 long posts you have to scroll down a LOT to even see the sidebar where the “search, pages, archive, categories, and blogroll are. There is space for it to always appear at the top of the screen along with the first post and I have no idea of why it is not living there. Can someone help?