If you’d like to work with another worker cooperative, the best resource would be the Tech Co-op Network (but possibly in the process of reorganizing). Here are some other specific referrals to providers we are familiar with:
Web site design, development, and maintenance: Design Action Collective (Oakland) is a worker coop specializing in graphic design, visual communications, and web site development for progressive organizations. We also like FivePaths (SF Bay Area), EcoTechie (Port Townsend WA), Sassafras Tech Collective (Ann Arbor), C4 Tech & Design (New Orleans), and Palante Technology Cooperative (New York).
Web strategy: Aspiration (San Francisco) is a great resource for technology planning/process help and RFP design.
Other hosting services: For server colocation or virtual server hosting, try our colo provider, MonkeyBrains (San Francisco).
Newsletter/CRM service: If you need message personalization, list segmentation, open rate tracking, and such, check out the Salsa platform or Campaigner, or take a look at this excellent survey of other providers as of January 2012 put together by our friends at Groundwire.
Computer service and data recovery: In San Francisco, trust TechCollective.