I stumbled across an interesting site today. At first I thought to myself, $#@* Microsoft is buying Firefox! but it appears to be a very well done parody of how Microsoft once again ripped off what was already there and found a way to screw it up and call it IE7. What's even cooler, is they chose to use Element for their design. Funny stuff.
Check it out: http://www.msfirefox.com/
Often times in the forums when someone has a display problem with their template and I can't replicate it from my Mac, I usually ask them for a link or a screenshot of the problem. I must say I am very surprised at the number of users who are still operating in Windows XP with ClearType disabled.
If your fonts look ragged or almost pixellated, you may be able to make your eyeballs a lot happier by turning on ClearType.
I came across a great example/article by a designer named Andy Rutledge about the purpose of HTML tags, and why HTML tags contain "no presentational value". His argument is to let the CSS handle all the presentation, while HTML tags only serve to provide "meaning and context to the content". Brilliant work, Andy!