Anyone who hasn't seen the new Google notebook is missing out. This is one of the best Firefox extensions I've had the pleasure of using so far.
It allows me to log all my notes right there in my browser, while I'm at work or at home. What happens if I want to get the notes back after I get home? It's all on Google's servers - a web centralised OS whilst scary to some (paranoia?) is truly the answer to the 'thin client' nightmare that some sysadmins insist is so brilliant.
Once you get Google Notebook and Google Sync for Firefox then you'll NEVER need to set up a browser the way you like it again... Can you think of many more appealing things?
Google, please do windows next, thanks.