Atlas is a super handy little QGIS plugin that lets you generate a map series from a composer and a coverage (grid) layer.
The authors of the plugin are now looking for some funding to make it a core part of QGIS. Making it part of QGIS would mean integration into the composer and maybe APIs for developers to add extensions.
The authors are looking at raising 7000€ in order top get the work done, but the more money raised the more features that are added.
More information can be found at http://www.oslandia.com/?p=1243