Sadly, we are stuck with IE7 for a while yet. Market share has plummeted below the market share of IE6, but it is still over 10% and more than relevant.
Although we draw the line at allowing users to administer Apostrophe
sites in IE6 (of course it supports IE6 very well for the end user experience), IE7 ships with Vista. And Vista is still being deployed today and is sometimes institutionally mandated. So it isn't easy, yet, for some of our potential clients to upgrade even if they want to.
Finally I found a mention of the IE7 mode built right into IE8. And it's awesome, as long as you don't trust it blindly. Here's how it works:
1. Launch IE 8 (you might have guessed this part)
2. Pull down the Tools menu
3. Pick "Developer Tools"
A Firebug wannabe pops up on your screen. It's not Firebug, but it's pretty useful, in a "dammit this bug only happens in Internet Explorer" kind of way.
There there now. It's OK to cry. I know you've waited a long time for this. No need to swear your undying fealty, just buy me a beer at SxSW Interactive.