There are now a wealth of tools available online, either free or for nominal sums, to support many of the information needs of a sole consultant or a small project team.
This page is for collecting some useful links.
Most popular in this space is Gmail. I markup articles on productivity tips with Gmail http://delicious.com/synesthesia/gmail here
Remember the Milk
Jungle Disk (backup software runs on your PC, stores your backup on Amazon S3 service)
Editgrid (anyone used this one?)
Gliffy (any reports on this one?)
zoho has a free database creator which has a limit on the number of records - after the limit is reached you start paying per month
5pm Web (PC World liked this one - any reports?)
(any reports on this one?)