Well, I recently finished Mass Effect, because I rage-quit. But due to my uploading schedule, you won't be seeing that video until October 3.
But besides that, I have other games I am currently recording, like Psychonauts, and I'll soon be starting on Amnesia: The Dark Descent, but that won't be seen for over a week, because I already have a week's worth of videos uploaded and scheduled for to be published on certain dates.
I only like to do no more than two long let's plays at a time. Otherwise, I won't have room on my main page to show the games that I am currently working on.
Then there's Happy Wheels. It is currently an ongoing weekly series. Season 1 is almost over, but Season 2 will start in December.