Favorite stationery shops/bookstores in Switzerland?

For Zurich, I can recommend Papier 5 for stationery, especially paper and cards. Hieronymus was incredibly stylish and fun to browse but I couldn't afford anything more than a pencil - approach with extreme caution! ;-) And I've only ever looked into the windows of Landolt-Arbenz (both old and new locations, but I was envious. (It's not in the budget either.)

I'd love to go to Caran d'Ache in Geneva one day (has anyone been?) but it's pretty easy to pick up a box of pencils or a pen at most stationery or book shops (including Zurich airport) - I also got a nice set of 'colour your own cards' one trip.

For books I've mostly been to Orell Füssli, which is a chain, but a solid one. There are a few very interesting independents, but that's not been what I was looking for on previous trips (more like the next volume of a favourite local series or author to read by the lake), so I can't really recommend anything in particular - also, I've not checked what they have in English. Would happily piggy-back on tips there too.

Stauffacher in Bern

On the inexpensive, yet always fun to poke around in side of things is Søstrene Grene - I don’t know how many countries this shop is in, so maybe you already know it.

I was on this tour last fall. I bought a book for my flight home from Stauffacher in Bern. I also bought souvenirs and really neat greeting cards from a couple of tiny shops along the Kramgasse in Bern. You will walk along the Kramgasse during your morning walking tour of Bern. I spent my free time that afternoon wandering around the area looking for some last minute souvenirs after my guide recommended it. My records show that one place I bought things was Orell Fussli, although I didn’t recognize the location when I checked it just now!

Thank you for the suggestions - I'll add them to my list!