Mission Improbable is my singleplayer mod for Half-Life 2 : Episode 2 that I work on whenever I can find the time. It's planned over 3 maps, of which 2 are already released. The development follows that of Minerva, in that whenever a new map is released, the map before it is updated and tweaked so that it is possible to seamlessly play through the entire mod.
Part 1, simply named 'Mission Improbable' was released all the way back in July 2009. Only last month I got around to releasing Part 2, 'Reverse Advance', along with an update to the first part. It's available in the download section.
I am currently working on the third and final map in the series, and hopefully I will be able to keep a sort of developer log right here, with progress updates, WIP screenshots and so on.