1) Chalk
You cannot draw well with markers; it's even harder to draw with an interactive whiteboard. Subtlety matters. While a 256 color Powerpoint of a beating animated heart garners plenty of woo factor,
It's cheap! A dozen chalk sticks will run you less than a dollar; the same number of erasable markers costs a magnitude more.
It's therapeutic--snapping a piece of chalk in two satisfies the amygdala. Try breaking a marker in two. If things get really bad, you can eat the chalk as an emergency substitute for TUMS.
2) Overhear projectors
Using an overhead projector well requires a strong grasp of the material you are presenting. It has the added bonus of allowing you to face your students, your visage lit up eerily like a bad scary movie.
An overhead projector is a great source of light for biology teachers--I still dig one out when I want to show that chlorophyll fluoresces, or to test light's effects on oxygen production in plants.
(I won't even get into my talent for shadow puppets....)
3) Analog clocks
I still have no idea why they left--an analog clock gives more information than the digital variety, hands down. I guess you could argue that they cost a smidgen more--I do have to invest in a new battery every 3 or 4 years--but even I can spare a dollar or so a year.
I do not hold onto the old for old times' sake. I hold onto tools that work well, until replaced by something that works at least as well, everything else being equal.
Spending a lot on an interactive whiteboard does not make you smart, only your wallet.
