IE 7.0.5730.11 on WinXP
On http://tastespotter.blogspot.com/ the pop-in red box seems to work Ok - it fades in and expands from the left margin.
However, the layout seems to be broken as the right column of the page (your picture, etc.) is displayed below the fade-in box on the left column. Also, the box under the "Buy the book" text shows an embedded 500 error page.
On http://blog.cooklikeyourgrandmother.com/ - the red fade-in box fades in and expands from the left margin even if I don't page down. Everything is also in the left column here.
HTH a little. Let me know if you want me to mail you a screen-shot.
Cheers,
Scott.
