Multiple MongoDB instances on same server

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http://serverfault.com – We set up a MongoDB development server on CentOS 6.3 and were able to separate different projects by using separate config files and rc scripts. Now we're looking at setting up a MongoDB production environment. I've read that it is not recommended to host multiple instances of MongoDB on the same server in production. Does that mean each project will need its own production MongoDB environment? These projects are not very "big" and so do not require a lot of resources, so it feels like we're jumping the gun by giving each its own host. Perhaps we just need to get our heads out of the RD (HowTos)