Whimventory now works with IE8! The last holdout of incompatibility was the Whim It! button, due to some very strange Javascript inconsistencies in Internet Explorer. In any case, we got those ironed out, so you Internet Explorer users will be able to use the bookmarklet without issues from now on.
If the bookmarklet continues to fail for you in IE, your browser is probably using a cached version of the script. In order to fix this, simply clear your browser cache:
Please let us know if you continue to have problems!