I did my web design on a Powerbook, and use Camino as my primary browser so I did not see my site on IE until after almost finishing the design. I am working on a church sites redesign at http://alliancechurchpoughkeepsie.org/siteone/ Please look at the site on Firefox, then look at the disaster on IE. My drop down menus dont work, the colors aren't correct and alot of the content gets squished at the top.
1) Graphics Problem: 24-bit transparent PNG's don't work in IE unless you use the AlphaImageLoader Filter 2) Navigation Problem: IE only supports :hover applied to anchor tags (some DOM scripting can add the functionality to LI's, or just use links)
Two little bits I collected lately: .HTC behavior files for applying to IE.
Whatever:hover adds :hover support to arbitrary page items.
PNG behavior for PNG transparency. (I think this only works with PNGs called in IMG tags, but I'm not sure. I haven't had a project that would have needed it lately.)