While cautioning that some trends will take longer to materialize than others, Gartner warns businesses not to ignore the potential of issues such as open source and cloud computing to change life for IT groups and the businesses they serve.

"These areas of focus imply a significant groundswell of change that may in turn change the entire industry," said Daryl Plummer, managing vice president and Gartner Fellow, in the company's press release.

Of Gartner's 100 predictions, here are the 10 that top the list:

1. Apple Grows More Powerful

Apple will have doubled its computer market share by 2011, Gartner predicts. Contributing factors: Apple's software integration; frequent innovations; interoperability across multiple devices—and the failure of the rest of the industry to make similar innovations.

2. Pocketable Internet Takes Off

By 2012, 50 percent of traveling workers will ditch notebooks for new products such as inexpensive new classes of Internet-centric pocketable devices, Gartner predicts. Users will demand the ability to create a preferred work environment across multiple locations.

3. Open Source Grows More Popular

Open-source technology will be a component of 80 percent of all commercial software by 2012, Gartner predicts. Why? Lower total cost of ownership and increased ROI for both users and vendors. Gartner says that to stay competitive, most large software vendors will at minimum need to create embedded open source strategies.

4. SaaS Gains Traction

At least one-third of what businesses spend on application software will be service subscriptions rather than product licenses, by 2012. The growth will be fueled in part by the endorsement of leading applications vendors of the SaaS model, Gartner says.

5. SOA Enables Growth of Cloud Computing

By 2011, early technology adopters will buy 40 percent of their IT infrastructure as a service. High-speed bandwidth will enable infrastructure located offsite to deliver fast response times, and service-oriented architecture will give rise to increased popularity of "cloud computing." Gartner recommends that IT buyers should strengthen their purchasing and sourcing departments to evaluate new offerings.

6. Green IT Flowers

Green IT will gain traction by 2009: In a year, environmental criteria will rank among the top six buying criteria for determining IT spend, motivated at first by a move to contain costs, Gartner predicts. Much potential exists to improve the environmental footprint without higher price or lower performance.