Since the arrival of application virtualization I have been fairly supportive of the concept. It can really bring some benefits and solve some peoples integration issues.
Application Virtualization is not however the solution to all your problems and may even introduce new difficulties into your environment.
What is good about application virtualization?

Virtualization has been heavily pushed in the IT industry for about 3 years now, but in some areas the take up as been fairly slow. While in others, the move to Virtualized servers was taken rapidly, maybe even before the technology had matured enough. The Virtualization products from VMWare and now Citrix have come along [...]