Use this cool site/service to find out about your clients browsers:
http://findmebyip.com/
After you have signed up you can just have them go to http://findmebyip.com/YOURCOMPANY/your-tag and you’ll know all about their IP, browser, CSS3-support etc…
You can do usability tests online:
• http://feedbackroulette.com/
• http://www.usabilla.com/
• http://theclicktest.com/
• http://navflow.com/
• http://www.feedbackarmy.com/ – paid but with comments/questions answered
• Af this one is brand new – sup easy ad clean, not need to even signup to do a cklicktest: http://www.usaura.com/
• http://www.loop11.com/
• http://www.optimalworkshop.com/?r=uxpack – also have some card sorting and testing of information architecture
• http://www.invisionapp.com/tour
This is acutally not for testing but for creating wireframes of navigation/pages and that kind of website planning: https://www.jumpchart.com/
So you want to track if your email is opened by the recipient – and you are using Outlook.. Then this is for you:
http://attachmetric.com/tutorials/
This might be more mailinglist oriented:
http://www.politemail.com/features/OutlookEmailTracking_Screen.aspx
Subscription service: http://www.mailinfo.com/web/
BUT wait for it…. There is a free option as well. 🙂 Check out http://www.spypig.com/