PDA's and laptop computers present portability issues. Laptops are usually able to withstand multiple voltages, but PDA's need converters to adapt to higher electrical voltages outside of the Americas. Both require a selection of adapter plugs and phone jacks. Make sure your PDA can run on disposable batteries to avoid carrying a converter. Additionally, most Internet service providers that claim to be global are exaggerating.
Laptops are heavy, and cybercafes are plentiful.
Leave the laptop at home if you will be on the move a lot. PDA's are useful as address books and notepads, but they must synch with parent computers for more complex functions like downloading. Additionally, they are a security risk and can be ruined by sand, dirt and water. If you must carry expensive electronics, plan to carry insurance. Reimbursement claims often require proof in the form of a local police report.