Most of the nursing drug texts come in high quality softcover rather than hardcover because a different edition comes out every year as new drugs are approved. Although I'm not a nurse I do use dozens of medical and nursing reference texts. The paperbound version of Saunders includes a mini-CD ROM, which has 400 different searchable and printable drug cards. A mini-cd rom is smaller than a standard cd, and fits into the deep well in the center of a cd player. So it will work on almost any PC with a cd drawer. The difference in this and the CD-PDA is that the PDA version is a software program (powered through skyscape, which is a major medical information vendor) that is more interactive than the text CD, and lets the user access different clinical information that isn't included in the text CD (which is basically the book in electronic format). If she already has a PDA, the software is very easy to use - it comes on a mini-cd or it can be downloaded from a website. If you want to check out all the different titles available for PDA, go to www.skyscape.com - they have the best selection of medical reference materials.
Butterfly RN is a nurse, and quarterhorsegal is a pharmacist, so you might want to send them a pm - I'm sure they will have some valuable input.
Congratulations on your daughter's certification - you must be very proud.