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There are many other site monitoring tools that you may be interested in.
Free website monitoring with 15 minute interval:
* Website monitoring service for Http, Port, DNS, FTP, MySQL, SMTP, POP3, IMap & SSH
* Easy way to detect downtime and uptime instantly and more effectively
* Free Instant alerts through E-mail, RSS Feed and Google gadget
* All users can subscribe to SMS alerts
* Analyze website’s periodic performance through graphs, charts and statistical data
* Periodical Reports customizable by all the users
* Monitor upto two websites free for a lifetime and save $48/year
* Free monitoring is for 15 min interval period
* Paid users may monitor more sites and set the interval period from 5 min
* Paid users can customize the e-mail notification
* Tools to check the availability of your sites, DNS Servers, Ports.
* Tools to find the IP address and server location of your domain names.