Not much of a surprise of what is included in this list, but I would have expected Green IT to appear higher. I would also have expected social networking/enterprise mash-ups to still be in early days of adoption and exploration, rather than in the top 10

1 - Virtualisation
2 - Cloud computing
3 - Servers - beyond blades
4 - Web-oriented architectures
5 - Enterprise mash-ups
6 - Specialised systems
7 - Social software and social networking
8 - Unified communications
9 - Business intelligence
10 - Green IT

Full details here: Top 10 strategic techs for 2009 on silicon.com