Daniela - they are GREAT. I just got my first hand-held organizer a few months ago, and it makes it SO EASY to co-ordinate between working from home and the office with the sync funtions!!!!!!!!! You can put birthdays in there and set it up so it reminds you about them in advance - EVERY YEAR. I use it not only for work now, but for the cat's meds, etc. Now I have an organized phone book - and a back up, again, because of the sync function!
I was using Outlook, though, so instead of a Palm, I got a Pocket PC. I went with the Compaq - I don't need the mp3 player, because I only use it to carry around Word and Excel files I need in addition to the calendar and contact info.
The difference between a Pocket PC and a Palm is that a Pocket PC uses "Windows CE" as the operating system, and you can link directly with Outlook and other Windows stuff - with Palm or other operating systems, you have to use their organizer software. If you want to sync with your inbox and you use Outlook, I'd really recommend going with a Pocket PC instead of a Palm. If you want to be able to surf, you do have to purchase a separate wireless access package - I think it's like $9 a month or something. Just make sure you have enough memory (that's what bumps up the prices though) so it's not real slow, and make sure it's wireless ready. With the iPAC I bought, adding wireless would be something that goes in the memory expansion slot, though I think there was one already wireless capable. I've got 64mb of RAM - it's been more than enough for all the crap I carry around in it, although I don't surf with it nor do I store mp3 files on it, so I don't know about that.
Go for it and have fun!!!!!!!
BTW - Blackberry now makes a PDA that is both Pocket PC operating based (using Windows CE operating system) AND a phone - so not only do you have your contact info and all the other stuff, the phone will dial for you and it's got a larger screen for text messaging and surfing. It's called a Blueberry. I have no idea what it costs - I expect a lot though. There are several phones now that are PDAs, though most are Palm software based. Compaq makes one called the i700 - it's a Pocket PC version combo phone and PDA, ready for surfing, etc.