These are the 25 companies that, in the view of ASPnews, are the most influential software or infrastructure providers for the ASP, Software-as-a-Service (SaaS), Web Services, Service-Oriented Architecture (SOA), and Utility Computing industries. For inclusion, companies must meet the following criteria:

• Have a substantial and active customer base of providers
• Be active in their support and promotion of network-based applications and services
• Invest in innovation in the online delivery of software-based services
• Be recognized as a leader by others within the industry

Company	Description	Location
Abridean	Infrastructure ISV	Halifax, Nova Scotia
Adobe	Infrastructure ISV, Software-as-a-Service Provider Recently acquired Macromedia	San Jose, Calif.
Apptix	Private-label Service Provider	Sterling, Va.
BEA Systems	Infrastructure ISV	San Jose, Calif.
BMC Software	Infrastructure ISV, Infrastructure ASP	Houston, Texas
Citrix	Infrastructure ISV	Fort Lauderdale, Fla.
Computer Associates	Application Software Vendor, Software-as-a-Service Provider Recently acquired Netegrity	Islandia, NY
Data Return	Managed Hosting Provider	Irving, Texas
EDS	IT Service Provider, Managed Hosting Provider	Plano, Texas
Ensim	Infrastructure ISV	Sunnyvale, Calif.
Hewlett-Packard	Infrastructure ISV, Systems Manufacturer	Palo Alto, Calif.
IBM	Infrastructure ISV, Application Infrastructure Provider, Systems Manufacturer Recently acquired Corio	Armonk, N.Y.
McAfee	Application Software Vendor, Software-as-a-Service Provider	Santa Clara, Calif.
MetraTech	Infrastructure ISV	Waltham, Mass.
Microsoft	Application Software Vendor, Software-as-a-Service Provider	Seattle, Wash.
NaviSite	Managed Hosting Provider	Andover, Mass.
Onyx Software	Application Software Vendor	Bellevue, Wash.
New!  OpSource	Infrastructure ISV, Software-as-a-Service Provider	Santa Clara, Calif.
Oracle	Application Software Vendor, Application Outsourcer Recently acquired PeopleSoft	Redwood Shores, Calif.
Progress Software	Infrastructure ISV	Bedford, Mass.
SAP	Application Software Vendor, Application Outsourcer	Walldorf, Germany
Sun Microsystems	Infrastructure ISV, Systems Manufacturer	Palo Alto, Calif.
SWsoft	Infrastructure ISV	Herndon, Va.
VeriCenter	Managed Hosting Provider Recently acquired Agiliti	Houston, Texas
Verizon Business	Infrastructure ISV, Managed Services Provider Recently acquired Digex	Basking Ridge, N.J.

What do you think of our choices? What ASP providers and enablers are missing that deserve to be here? And what companies do you think made that list that shouldn't have? Critique our selections — or make your own list — in the ASP Discussion Forums.