BloodR is a Adobe Flex technology based web application in a simpler and easier interface to keep track of your blood pressure and Weight. It’s still at alpha/beta staged application and there will be more interface tweaks need to be done, nonetheless it gives you report of your weight and blood pressure in a manner of interactive charts. It’s a nice tool to keep tabs on your health.

 
Here is how it reports the Blood pressure changes using charts.

Tracking your weight and weight report.

BloodR alpha signup is free for this moment but I’m assuming that it will become a paid service in future. Along with these information BloodR also pulls the health, blood pressure and weight related news around the web.