I had to "me-too" Jason's plugin. I have a directory of notes that I keep, e.g. in $HOME/notes/. They're small and I often forget what note contains the info I'm looking for. Instead of grepping, noted.py will do the searching inside deskbar.
As of 0.1 you must edit noted.py and set NOTEDIR to point to your note directory. In 0.2 I'll have that as a setup option.
Don't point NOTEDIR to a directory with a gazillion files, or large files. Small text files only. It searches just one directory deep (easy to change that if you so desire). It will also search folder names in that directory.