I relatively recently got into fiddling with Raspberry Pis and I have to say I think they are awesome. I've mentioned it in the videogames thread, but I currently use one to automate my Minecraft server backups as well as to be a map server for my world accessible by the other members of the server. I also set up an FTP server on it, so they can access the backups. For a while I even ran my server on the 4gb version of the RPi, and it worked well enough until we went above 4 simultaneous players.
Another little project I had running for a while was a script that hooked into the Open Weather API and sent me a text message every morning with the weather forecast. Two additional projects I'm looking at are getting a dedicated RPi for a NAS, and running a Discord bot.
I have another RPi which is serving as my Pihole, and it is doing excellent work blocking a significant number of ads and trackers across my entire network. In conjunction with Ublock Origin, we pretty much don't have ads any more on our computers, although I'm still to figure out how to complete my blocking goals on our mobile devices.
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