The Android 4.0.3 update for the Asus Transformer Prime brought with it some improvements to the Google Apps. However small any changes may be, nestled among them the Gmail application has received an interesting new feature menu known as "Experiments."
Experiments at the moment consists of a couple of new features which are probably not quite ready for the prime-time.
The first of these, enables full text search. Pretty straight forward this one, but still pretty useful. It allows you to index an entire message to search for keywords.
The second may not be immediately obvious as to its function. The contact chip is bascially the name entered into the To, Cc, and Bcc fields when composing a new message. Enabling this function allows you to long press on one of these contact chips, and simply drag and drop to another box.
At the moment, the updated Gmail app is rolling out with Android 4.0.3. But, enter the Android community, as the apk has been extracted from the Prime and is working just fine on the Samsung Galaxy Nexus. It has been tried on Honeycomb, but ran into some nasty force close issues meaning this is purely for Ice Cream Sandwich guys.
If you're keen to try it out for yourselves, hit the source link where you'll find a handy download.