Here's a few tagging tips I thought I'd share with the rest of the group just in case they're beneficial.
1. Each time I read a book (whether I do the reading in Logos format or if I own the print equivalent and read the print equivalent), I tag the book read. That way I can keep a track of what books I've read overtime.
2. For books I want to read, I tag them toread, then eliminate the to after I've read them. This allows me to see at a glance what books I'm interested in reading.
3. I've also marked a few counseling books and some other books with the tag ICE. Like in cell phones, these are my "In Case of Emergency" books. If someone calls me with a counseling need or if I need information on something critical a click away, I can lookup my ICE list and consult those books quickly.
Hope these help!