The embedded preview of Evercracked! was very, very slow when I checked it just now, so I haven’t watched it, but the UK Guardian article on videogame documentaries also includes some links to existing movies.

The King of Kong: Fistful of Quarters
A
fascinating look at the bizarre rivalry between gamers Steve Wiebe and
Billy Mitchell as they vie for dominance of Nintendo’s Donkey Kong
coin-op. Met with huge critical acclaim on its release two years ago.

Chasing Ghosts
Joyfully
nostalgic ode to the arcades of the early eighties. Performed well in
film festivals in 2007, but is hard to track down now.

8Bit
Described
as, “a mélange of a rocumentary, art expose and a culture-critical
investigation” this is a more cerebral approach to the subject matter,
analysing the impact of game graphics on art and music, with a nod
toward the chiptune scene.

Frag
Reasonably
recent documentary on professional gaming circuit, considering the
dedication of the players but also the corruption, money and drugs
seemingly blighting the emerging sport.

I hope soon to see the forthcoming Get Lamp on this list.