Spyware More Common in Popular Software?

Keith Young asks: "Over the past month, we have seen a 1500% increase of spyware denials on our firewall primarily due to WildTangent 'spyware' installed with AOL IM 5.5 and adware installed with Weatherbug. Since many of these widely-installed types of applications have an automatic upgrade feature, how can these be tested for license agreements, spyware, and security 'irregularities'? Is this another reason to approach management to choose only open source alternatives?"