Cross-Browser Min Height
This works because (thankfully?) IE treats "height" how "min-height" is supposed to be treated.
Source: Dustin Diaz
Alternate Using Expressions (IE Only)
height: expression( this.scrollHeight < 501 ? "500px" : "auto" );
Sets the minimum height in IE to be 500px. Make sure that this.scrollHeight < 501 is 1 px greater than the minimum height that you want or you will get some strange results.
*May or may not contain any actual "CSS" or "Tricks".