Other than answers.google.com, catalogs.google.com and
froogle.google.com, are there any other Google beta services out
there? All I need is the URLs. Doesn't have to be a 100% complete
list.

A response within 24 hours gets 5 stars (others unrated).

spurious..

Thanks for your question.  The following is a list of available Google
Beta or prototype test services.:

The following are from Google Labs, http://labs.google.com/, and use
of all of these services is covered by the Google Labs Terms of
Service which can be found at http://labs.google.com/labsterms.html :

Google Webquotes-annotates the results of your Google search with
comments from other websites
http://labs.google.com/cgi-bin/webquotes

Google Viewer-displays the pages found as a result of your Google
search as a continuous scrolling slide show
http://labs.google.com/gviewer.html

Google Glossary-Find definitions for words, phrases and acronyms
http://labs.google.com/glossary

Google Sets-Automatically create sets of items from a few examples
http://labs.google.com/sets

Voice Search-Search on Google by voice with a simple telephone call
http://labs1.google.com/gvs.html

Keyboard Shortcuts-Navigate search results without using your mouse
http://labs.google.com/keys/index.html

The following are beta projects of Google:

Froogle-Find product information online
http://froogle.google.com/

Google Answers-Expert research service
https://answers.google.com/answers/main

Google Catalogs-Search and browse mail-order catalogs online
http://catalogs.google.com/

Google News-"Google News presents information culled from
approximately 4,000 news sources worldwide and automatically arranged
to present the most relevant news first"
http://news.google.com/

Google In Your Language-Translation of Google help and search
information
http://services.google.com/tc/Welcome.html

Google Translate-Language translation tool
://www.google.com/language_tools

Google Web API's-Develop web applications using Google
://www.google.com/apis/


Thank you for your question and I hope the above information is
helpful.  If you need any additional clarification, pleaese let me
know.

Regards,

-THV

Search Strategy:
None

References:
Google Services & Tools
://www.google.com/options/index.html

Google Labs
http://labs.google.com/

tar_heel_v-ga,

Many thanks for your comprehensive response and best wishes for the holiday season.

spurious-ga

suprious...

Thank you for the rating, the generous tip and the holiday wishes. 
The same to you.

Regards,

-THV