Justifying Posts and Sidebar

In my posts the first one is left justified but all subsequent posts show up as centered. It seems this only happens in IE and not Firefox. Can anyone help me fix this?

my blog

I also have my side bar centered when I would really prefer to have most of it left. I know I can stick in <center> </center> tags to center something in my sidebar … how do I do this for left justification (<left> does not work)?

Thanks,

Eric