I use and test my web applications and blogs primarily on Firefox these days. I do however occassionally look at Internet Explorer. Mostly they are nearly identical with few known differences.
Simple Thoughts Blog - <b>Java</b> and Web Software
This time after I uploaded a new logo for this blog I was in for a nasty surprise.

My logo looks awful under Internet Explorer. Apparently IE interprets transparent background as grey. What a wonderful job they do with standards!