The giant Google, the number 1 of the search engines, is not so "giant" regarding the age... Today is an important date for Google: it's the 6th Birtday of the search engine.
Good luck Google, I hope for you other years of great successes like these first 6 years. 
One of the best application I've installed on my Symbian phone (Nokia 6600) is absolutely Agile Messenger, a wonderful (totally FREE) and well done Instant Messasing application for mobile phones that supports Istant Messaging applications such as ICQ, MSN, Yahoo!, AIM and many others.
In these days (but I've discovered it only today from a newsletter) Agile Mobile has released the new 3.0 release of this software, that has new feature such as:
A new user interface ICQ, AOL and Yahoo now support alternative port numbers (25,80) Improved support for chinese characters in Nokia Series60 versions Push-to-Talk. You can now send voice messages from your phone Fixed AOL contactlist bug, that caused online contacts to show as offline Better ICQ support for TrillianReally interesting the new PTT (Push-to-Talk) feature... download in progress and immediate installation required! 
UPDATE: installed! Wonderful... it updates my previous version of Agile Messenger without problems, with all the settings. The new graphic interface is wonderful (the light blue desktop with a cell phone is amazing), contacts status is now more clear (I've tryed to connect on my Yahoo! Messenger account).
The answer to this topic seems to be YES...
The need for a Database-driven file system is emerging in this period and WinFS is the main project on the air (for the Mac world there's Spotlight). With a DB filesystem, you could easily search and index all your files, documents, emails, contacts etc. just like on a normal database, with complex queries etc (for example, you could easily search your filesystem for the most 10 recents documents modified by a certain user).
The Linux world obviously has taken this direction too and various project are born in these days.
One of the interesting tool for indexing your data on a Linux box that I've retrieved is Beagle, a tool (for the Gnome environment now) in a very early stage of development but interesting because it's written in C# using Mono and Gtk#. The indexing is handled by Lucene.Net, a C# port of the Lucene indexer (you can find the source code in the GNOME CVS repository in the module beagle).
Today I've discovered another interesting tool for a Database filesystem: DBFS.
This is an early stage project too, but seems really promising (this is built on KDE environment) and a well-done implementation.
If you're interested to this type of application, you have to give an eye to this project!
All these projects obviously at the moment are not working well, but they are an important sign of a future changement on the file system world... the new file system generation will be certainly database-driven oriented.