Not too much at the present. See HcoopVolunteerTasks for a list of things that could be done if you happen to be inclined toward volunteering for the coop.
Current
Virtualized Hosting Costs
See VirtualizedHosting2018 for discussion about running HCoop on rented virtual machines instead of on hardware we own.
Old Stuff
New Server Discussion
See NewServerDiscussion2013 for discussion about purchasing a new server to be a virtualization host
New Payment Processor
See PaymentProcessor2014 for discussion about setting up a replacement for Google Checkout
Services Upgrade 2009
See Migration2009