One of the limitations that I have found when using Linux is synchronizing data between computer and a device, may it be a mobile phone with PIM or a PDA.
On my Mac, I just use iSync (see image). I am still looking for a simple and elegant solution on Linux. Imagine being able to sync your Thunderbird address book and Sunbird calendar entries to your device with just a single click? How about sync-ing your data with your Google Calendar and Gmail address book?
If you know of the simplest and most elegant way of synchronizing data, please let me know. Thanks.