Cell phone and smartphones (cell phone/PDA combo units) usually have that ability but it's not an option with today's line of PDAs.
I have an HP2950..like it..but hate not having a vibrating alarm like my old palm pilots. I don't like having the loud alarm go off for my next meeting when I am in a lecture/conference. Are there any palm or pocket pc pockets that offer a vibrating alarm anymore? Just use the PDA for calendar (outlook) and contacts primarily. Thanks