The next point release is done and pushed out to the Chrome Store. This was a quick one, because there were a couple fairly major styling issues that had to be fixed.
I was already working on the next feature, tagging, so I was able to include that functionality in this release, thus the new point version (as opposed to being merely a bug fix release). As far as how tagging actually works, it functions just like using tags on Twitter or Google+. Just put a pound symbol (#) in front of any word, and Sticky Notes will recognize that as a tag. You can then choose that tag from the new tag dropdown (located next to the star button on the top bar) and filter your notes by that tag.
Another added feature is the ability to lock notes. Locking a note will disable the ability to make text, title, color, and font changes. You can still expand/collapse, resize, and reorder (in grid view) locked notes.