I have a single 4GB model Linode and I use it as a personal server. I originally set it up to act as an email server, just for my own personal vanity domain. I don't use it for that anymore, but it's proved to be useful for many other things.
Right now, I run a Minecraft server on it and I also use it for a little bit of software development. I also use it as a jump host, if I need a stable place to SSH from my laptop to get to other online resources. It means that I only have a single point that I go through to get to the other stuff that I need.