Global CSS change: ivlebody no longer has 1em of padding (it has none). This is because most apps were disabling it (and it had to change anyway for other reasons -- see below).
Hence, all apps which WERE disabling the padding have had that removed, and just work by default. (console, browser, tutorial) All apps which WEREN'T disabling the padding (very few) now have to manually include an extra div. This has been done on all such apps, and has been heavily documented (both in the CSS file and doc/app_howto). (help, dummy, debuginfo).
media/common/ivle.css: The real change here (which isn't yet being used) is that ivlebody is now positioned absolutely and takes up all the space on the canvas. This is to be used for full-page layouts in console and browser.