You can overwrite !important contrary to what most people believe. You can even use this technique to overwrite inline styles applied by JS or 3rd party plugins (ex. Facebook!!) The most powerful way is like so:
td[style] {height: 110px !important;}
It acts as if you injected the style inline to the html because you are applying the styles to the actual style attribute of the tag. The combo of being inline and !important should trump everything, except for a style that is applied later and also inline and !important
Here's a fiddle with the working code: http://jsfiddle.net/9LvzP/
You can see that even though background-color: green !important
comes before background-color: blue
blue is more powerful and gets applied