Google’s very own “Google Groups Guide” Google group is blocked for no known reason. This is a Google Groups help and support forum. Here’s more info about it:

The Google Groups Help Forum is the primary channel for getting your Groups questions answered. You’ll find that this community is always buzzing with activity. Get ready to meet some expert users of Google Groups who’ll provide friendly advice about the product (if you’re nice to them). The Google Groups Guide and Groups Guide Ray, Google employees, regularly monitor this unmoderated Help Forum. The Guides will only respond to questions if there is valuable information to share with our users that has not already been provided by the Forum’s resident experts! Messages from Google employees will appear with a blue “G” badge.

From the description I see no reason to have it blocked. Here is the blocked URL:

http://groups.google.com/group/google-groups-guide/

To help getting it unblocked as soon as possible fill the form at internet.gov.sa, write an email to unblock@internet.gov.sa or send a fax to +966(1)2639290.