This free application may be of interest if you use G-Mail or another web-based email service:
What is Affixa?
Affixa makes your webmail account part of Windows;
Affixa makes gathering and preparing the files you want to send easy;
Affixa gives you the choice of which web or desktop mail system you use and when;
All the features available in Windows Outlook that were once only available to your desktop mail-using friends are now available to everyone!