I found many uses for tags, but here is one... I smoke a lot cigars and frequent many cigar lounges. Each lounge carries a different variety of cigars, some of which are only available at particular lounge. I save a note for each cigar, and then tag it with a variety of tags, such as -favorite -cuban -lounge 1 -lounge 2 -lounge 3 -lounge 4 etc. So, when walking into lounge number 2 I pull out my Nuxus 5, fire up Evernote, and select saved search of "tag:lounge 2" and "favorite". It will show me a previous smokes that I enjoyed that I know are available at that lounge.