In my opinion, we need both Daniello's Noteself and Arlen's server. They solve different problems.
NoteSelf is for cloud synchronizing your tiddlywikis that will only ever be for your own personal access. Or possibly shared among a small group. It offers offline availability and online synchronization but it does so by breaking the "one file wiki" approach (although it includes functionality to save a single file). One wiki, one (or a few) person, many devices.
Arlen's server keeps the one file but it only exists on one device. There is no cloud component. There is no sync. There is no sharing. One wiki, one file, one person.
Yes, you can skip the cloud component for Noteself (but then you are only using a subset of it's capabilities) and you can share your one file with Arlen's server, but that isn't part of Arlen's solution (as far as I know). They serve different needs.
And yes, they both deserve support from us.
The Raspberry Pi Pocket Server, on the other hand, is a much bigger (and in my opinion, much sillier) idea. Have something akin to a home network server (files, website, media, whatever) that you can carry around in your pocket. Useful if you have a home server you can access over the Internet but are going somewhere that doesn't have reliable Internet access. Otherwise, it is (to me) mostly an amusing exercise. Other people might have more practical uses. It's also probably not a good idea to bring onto an airplane. I'm sure gate security would be asking a lot of questions.