Table borders are thin lines which can be covered up by the cell contents. Corners are also incomplete. Table cell border properties are not observed correctly. Use my sample file and compare with MSIE 5. for border suppression. Most browsers will check 'set' value against needed and use the maximum of the two.
Tables become confused if stacked more than two levels down.
When lists are included in blocks that are centered, the list bullets are not centered but the text is. This is in contrast to action of other browsers and leads to unusually displays in some table situations. Fixing the document width and forcing scrolling seems more appropriate. The default img size is too small. Images are not floated correctly although this is part of HTML 4.0 specification.