Coleman says that the company has been working on the feature for 18 months, but the original version of Gmail had something similar to this before it launched, but was removed because it simply wasn’t ready for mass consumption. Now it is refined enough for use by all.
Gmail Priority Inbox Launches: Your E-mail Will Never Be the Same
I can appreciate the patience Google took. Waiting years until one idea could be implemented just right.
(via Instapaper)