Update 2: Have a look at loomp.org. These guys are doing great stuff following a "Simplicity is key" approach.
A short list of apps that I'd love to see for a more streamlined life/workflow:
A simple, beautiful, semwebby, linked data-enabled ...
- ... feed reader
- ... issue tracker / todo app (one setup for all my projects)
- ... wiki (for notes, ideas, structured data)
- ... address book
- ... calendar
- ... email inbox (with a bot that removes junk based on SPARQL rules)
- ... lifelog (private posts, project posts, status updates, location changes)
- ... online profile generated from all my data
- ... browser-based system to explore and display the integrated information from my data apps
- ... alert tool for selected topics/discussions on Twitter, IRC, and mailing lists
- ... photo organizer
Some of my development work is probably in line with this roadmap, but until now I was more in the "Breadth-first" camp, often moving to the next interesting exercise once I had an initial proof of concept. Switching to "Depth-first" could already simplify my life a lot. Focusing on a smaller number of projects would not only cut down the amount of low-activity projects and parallel todo items, but should also allow me to release more stable and market-ready products in less time.