(any modern OS) Instiki: Cool Wiki engine. Yet another stop along the road in my quest for the perfect personal task manager / to do list / project space. The notable things about this one: nicely self-contained (runs on its own included webserver), supports Markdown and Textile, runs on Ruby (Ruby built into OS X is too old, grab the prebuilt version that embeds the Ruby runtime or install a current Ruby dist via Darwinports or Fink).
(web) Memigo: A headline clipping service that learns what you like, can export feeds.
(mac) iEatBrainz: Uses the MusicBrains metadata engine to help you clean up your iTunes library’s metadata. Great for doing something about those “mystery tracks” that you collected from who knows where.
Murphy’s Law of Research:
Enough research will tend to support your theory.