PC World had a look at a lot of PDA's and they also reviewed the Cassiopeia IT-10 M20 (now that's a strange product name) from Casio. Here's a short paragraph from their review:

The water-, dust- and shock-resistant Casio Cassiopeia IT-10M20 is intended for rough conditions. Its hefty design and price, however, are overkill for casual use, particularly since this Windows Mobile PDA lacks standard features such as wireless access and a USB cradle.



Link: PC World