<p dir="auto">As mentionned in the  2.1.0 new functionnalities list :</p>
<p dir="auto">"Improved prepended and appended inputs. No need to place the input and .add-on on the same line of code (sorry about that by the way). Break them up as you like and they'll still stick together with some crafty font-size working."</p>
<p dir="auto"><a href="http://blog.getbootstrap.com/2012/08/20/bootstrap-2-1-0-released/" rel="nofollow">http://blog.getbootstrap.com/2012/08/20/bootstrap-2-1-0-released/</a></p>
<p dir="auto">Since 2.1.0 there is no more need to put the input and the .add-on on the same line to avoid displaying a space. This work correctly with Firefox, Chrome and IE, but not on Safari. I tested with Safari 4 and 5 for Windows and I still get a space between the input and the .add-on if the inuput tag and the .add-on one are on two different lines.</p>
<p dir="auto">It would be nice to see a visual representation of what is defaulted/changed to for each element you can customize.  For example the @WarningBackground element that you can modify the color, it would be nice to see what that HEX code actually represented</p>