Seif has released Gedit Dash 0.1, a plugin for Gedit that uses Zeitgeist to display recently or most used items in new Gedit tabs. You can search both recently and most used items and also, the plugin generates previews which "try to jump directly to some code or text from your work".
Here are a few screenshots:
Gedit Dash works with Gedit 3 only and requires Zeitgeist and "zeitgeist-extension-fts". Both are already installed if you use Ubuntu. For other Linux distributions, you can get them via Launchpad: Zeitgeist | Zeitgeist Extensions.
To use the Gedit Dash plugin, firstly install python-pygments:
sudo apt-get install python-pygments
Then download it from HERE (or get the branch: "lp:~seif/gedit/dash"), extract it and create the ~/.local/share/gedit/plugins folder if it doesn't exists already:
mkdir -p ~/.local/share/gedit/plugins
Then extract the downloaded archive and place the "gedit-dash" folder under ~/.local/share/gedit/plugins (".local" is a hidden folder in your home directory so press CTRL + H to see hidden folders). Now all you have to do is restart Gedit and under Edit > Preferences > Plugins, enable the Dashboard plugin.