We stumbled on this article recently, which itemizes areas of CSS that differ between IE6, IE7, and IE8. We also have the sneaking suspicion that some developers aren't doing much in the way of browser testing, say looking at their sites in IE6. For anyone not dealing with the IEs regularly, it's a worthwhile read. IE6 users represent 12% of home page visitors; IE7 and IE8 add another 40%.

On the subject of browser testing, we've been moving toward YUI Graded Browser Support (GBS), checking content in the A-grade browsers, plus a smattering of other browsers. Although it doesn't agree with GBS (IE6 in XP is considered A-grade), I'm pushing for "aggressive graceful degradation" for IE6.

If you don't think you should be browser testing, visit the eCommunications Standards Web site in IE6, then visit the IE6 No More campaign.