At the new library:
Don't ask people to take their cell phone calls in the stairwell; it has amazing acoustics.
Patrons are going to forget which computer they are on, because the rows and rows of them are identical. Be prepared to suggest this potential explanation as gently as possible.
No one looks at the staff picks shelf up in Nonfiction; otherwise how could the fantastic oversize book on Great White Sharks that I put up there last night not be checked out yet?
The lady who always calls and asks for phone numbers never write them down, just tries to memorize them, so leave that window in your web browser open for a minute or two after she calls.
Keep a couple dimes in the back of your ID badge for when a patron is having a tough time with one of the printer or copier coin boxes.
Just hope against hope that you will never be the one on desk when someone has a problem with the microfilm machine.