Bill W:
I share your pain. I bought my first palm III with glass screen (I think) about four years ago and in a few months dropped it from my shirt pocket onto a hardwood floor while bending over to pick something up. Screen shattered. Paid $100 for a reconditioned replacement. Had it in my briefcase for protection. Went on a plane trip. Upon arrival, opened briefcase to find screen cracked. Decided that $100 every three months was too high a price to pay, so stopped using palm.
Fast forward to February 2003. Bought a Clie SJ30 with plastic screen as part of GTD implementation. A few weeks ago, found it on my kitchen table with its screen broken - not really sure how but think it fell from table onto floor and was put back onto table by someone. Called Sony to find that the screen repair would cost $150!
Bought a new clle sj22 for $149. Bought Staples' extended warranty for $20 because the salesman said that broken screens were covered. Let's hope I never have to find out.
All in all, I feel that these PDAs are too fragile for the real world, but I am not willing to give up the functionality (yet). I looked at a variety of cases, but, for me, the main attraction is being able to pop the PDA into my pocket and take it with me. I am not into belt-paks or carrying a case around with me in my hands.
I have considered a home-brew approach of applying foam tape in strategic spots around my clie but have not done this yet.
This shattered screen stuff is particulary irritating to me because for ten years I have carried a pocket-sized daytimer wallet and never had it break

. It has been submerged once, though, but I was able to separate and dry the pages. Anyway, I kept a photo-copy of the non-daily pages. What a high-tech backup!
I had a program to print out my contacts list in a format that fit the daytimer wallet, so I always had my address book handy.
Cost of day-timer wallet was about $50 and I bought a new one every two years, plus daily pages for about $50 per year. So far this year, in eight months I've spent $220 + $150=$370 on two Clie's.
One of the key reasons I stick with the Clie these days is that I can sync with outlook in a matter of seconds and take it all with me. In the day-timer model, I typically kept only the latest 30 days of calendar and daily notes and updated my address book only once per year (although I marked-up the book in pen). It was hard to find a way to keep my NA lists updated in and take them with me in my daytimer.
-Ken