I've had the Dell Axim X30 for about four years now - I bought it in August, 2004 - and I think it's finally reached the end of its usefulness.
The battery won't hold a charge any more. I only use the X30 for a few minutes each day - mainly to look up passwords, enter gas purchases, that sort of thing - but whenever I check the battery meter, it's down to 40% again. I can't use the wireless networking - even if I could get it to work (which I can't; thanks bunches, Dell & Microsoft), it drops the battery meter almost immediately into the danger zone.
The X30 has Bluetooth, but the one time I tried to use it for anything it didn't go so well.
The contacts list on the X30 is out of date. These days I keep my contacts on the iMac, with which the X30 will not synchronize. I'd rather keep my contacts online somewhere (the way I keep my bookmarks on del.icio.us), anyway.
The X30's calendar has some interesting items in it - a few years ago, I wasted an hour entering information about all Mercury, Gemini & Apollo missions - but it's as out of date as the contacts list. (At the moment, my calendar is divided between the iMac, to which I migrated my Outlook calendar two years ago, and Google Calendar, which I've been using for the last few months. I'm looking into ways to synchronize them. Spanning Sync seems popular, and it's relatively cheap.)
I have a few third-party applications on the X30: FlexWallet, Personal Vehical Manager and Personal Health. They're useful enough, but they're ancient & no longer supported. (And the publisher, Two Peaks Software, no longer exists, having been absorbed by some other company a few years ago.) They don't synchronize so well with the desktop versions on nessus, and it seems unlikely that I'll ever be able to migrate them and the data they contain from nessus to mindy.
So: the new policy is that no new data goes into the X30, since it's no longer certain that I'll be able to get it back out again.
I want to keep recording all the same day-to-day data that used to go into the X30 (my biggest hobby is creating databases, and generating charts & graphs therefrom), so yesterday I picked up a $3 spiral-bound notebook from the drugstore. It's cheap, it's portable, it never needs recharging, it can easily accommodate any data I feel like recording, and synchronizing with my various online databases is pretty simple: hold notebook in one hand, type numbers into the computer with the other.
At some point, the data in the X30 will be so far past its freshness date - and I'll have all the important stuff online, accessible from just about anywhere - that it won't be worth the trouble to cart it around any more. When that day comes, I'll hit the system-erase button and leave it in the breakroom at WRI.
Someone will want it, I'm sure.