Thanks for the response and getting back so quickly Edward.
I think the best example I can think off of the top of my head is something similar to the search function in a mac/apple contacts list.
When you pull up the contacts app on a mac, you can quickly search to locate a contact by beginning to type the first few letters the name in the search field:
As you type the name, the alphabetized list of contact narrows and you can quickly select the correct one:
Now imagine that instead of a list of phone/email contacts, that is the list of tags in MN3. My suggestion is to add a similar search feature that can narrow the list of tags that pops up when a MN user goes to tag a highlight or note in a PDF. Currently, I have to manually scroll through a long alphabetized list. I have a lot of tags, and having a search function similar to the contacts app one shown above would help to be more efficient while reading and tagging notes.
Make sense?