Alternatives to Citrix Remote Computing?

Dysfnctnl85 asks: "The company I work for relies heavily on remote computing through a Citrix MetaFrame server. The reliance on this stems from the structure of our accounting software and the fact that we have 2 remote sites that need to access this data all day, everyday. We are investigating alternatives to the Citrix system we currently operate. How do companies of similar structures deal with this type of problem? Is it feasible (or practical) to use Windows Terminal Services to achieve everything Citrix is capable of doing? This includes, but is not limited to, the ability to print from the Citrix session to a user's printer, the ability to access network drives from the Citrix session, access the user's local drives through the session, and the ability to use published apps. The main concern with this type of setup is the ability to print. What alternatives are there to Citrix?"