Today I tried Microsoft's Security Essentials alongside Blink. So far I have not encountered any problems at all. Both security applications seem completely happy with eachother. I did however, disable Windows Defender, this is no longer needed if you were to use Microsoft's Security Essentials.
http://www.microsoft.com/Security_essentials/
http://www.microsoft.com/security/portal/
My first impression of Security Essentials is it is very clean, light, simple, and straight to the point. There are not a lot of confusing menus to go through and is easy to understand. I give Microsoft a thumbs up for this product!
So for those that are concerned with the detection rates of the Norman AV in Blink, this is a great addon. I checked on the website av-comparitives: http://www.av-comparatives.org/ and Microsofts "Live One Care" which to my knowledge the Security Essentials is based off of, received a 90% detection rate in August 2009's test results. Norman's AV received a 84% detection rate.
On another note, Computerworld had the following article on Security Essentials:
http://www.computerworld.com/s/article/9138730/Independent_tester_Security_Essentials_very_good_
Either way, this is a step up for those that worry about these things, but still want to be able to use Blink.
I have attached some screenshots of Microsoft's Security Essentials for anyone interested in seeing what it looks like.
(Click on the Pictures to make them larger)
Microsoft Security Essentials's Home Tab