If you or a loved one is waiting for a visa and you have to check a website for updates on appointments list or waiting list (example: the dominican republic waiting list), then you can use
http://www.ChangeDetection.com/ for free to receive an email the same day the webpage changes.
The following example is for the waiting list page for the US Embassy in Santo Domingo, Dominican Republic.
Go to
http://www.changedetection.com/detect.html?url=Enter the URL of the webpage to monitor (US Embassy in Santo Domingo scheduled appointments example:
http://www.usemb.gov.do/Consular/scheduled_appointments.htm )
Enter your email address
Click Next
Check your email account for the validation code
Enter the validation code in the Activate Page Monitoring page of changedetection.com
Click Next
You are done.
If you want to monitor another webpage, you can repead the process (US Embassy in Santo Domingo waiting list example:
http://www.usemb.gov.do/Consular/waiting_list.htm )