CSS resets were a big breakthrough for me as well. :) Is `html {margin:0px; padding:0px}` really the full contents of your reset, though? I use a borrowed one that's much longer, but I suspect one as simple as yours would work for a lot of cases.
Also, does `<td width="25%">` behave any differently from `<td style="width: 25%">`?
It hasn't for me and I use both often. But I don't test every possible os+browser+version combination. I add width to the style tag only if I have a style tag already.
[edit: yes that's my entire reset, but I don't make wildly complicated layouts]
Yup + I've always imagined style tags require more parsing therefore are less efficient. In retrospect this is probably untrue, but still the code is shorter so I figure why not. :)
Interestingly, Arc Forum doesn't do any kind of reset in the css: http://ycombinator.com/news.css. However a lot of the tables set cellpadding=0 and cellspacing=0, which should cover most of the cases re: tables.