Moo cards - so much more interesting than business cards.
Each card can have a different image on the back - mine were created as part of the business card project by designer Michael Silvia. I would love to have him design a new website for me. www.moo.com
Because they have to see it to believe it.
Magnifying tools for presenters.
My personal favorite:
Virtual Magnifying Glass
More features, but also more hassle:
Zoomit
Words to pictures.
Flowcharting tool that runs in Excel and turns words into a flowchart. FlowBreeze
Plug space for both of your scientific calculators.
This cool device from 360 electrical has rotating wall outlets.