how can I quickly insert regularly used text ?(my email address or
full name for example). I know I can do this in applications such as
word and excel, but I would like to be able to do it on various sites
on the web.

Hi,
Thanks for the question.

With the free Google Toolbar you can Automatically fill out forms on webpages:
"AutoFill: Tired of typing in your address and credit card information
every time you shop online? AutoFill makes shopping a breeze by
enabling you to fill out web forms with a single click. Just enter
your info once in the Toolbar's Options dialog box and you're ready
for an online shopping spree. (Note: your credit card info stays
password-protected.)"

The info that you can have Google Toolbar insert into webpages is:
- Name
- Email Address
- Primary and/or Alternative (home) Addresses
- Credit card information (password protected).

See here for all information regarding the Google Toolbar:
http://toolbar.google.com/

For an animated demonstration, go here:
http://toolbar.google.com/T3/tour/toolbar.html


An alternative for Google toolbar is RoboForm:
Some of the feartures: 
- FREE. No Adware! No Spyware! (there is also a PRO version that costs 29.95usd)
- Memorizes your passwords and Logs You In automatically. 
- Fills long registration and checkout forms with one click. 
- Encrypts your passwords to achieve complete security.  
- Generates random passwords that hackers cannot guess. 
- Backs up your passwords, Copies them between computers.  
- Synchronizes passwords between computers using GoodSync. 
- Searches for keywords in your passwords, notes and Internet. 
- Portable: Pass2Go RF runs from USB key, no install needed. 
- PDA-friendly: sync your passwords to Pocket PC and Palm. 
- Neutral: works with Internet Explorer, AOL/MSN, Firefox 
http://www.roboform.com/

Regards,
Landog-ga