I film a webseries which I now release once a month, "FPS The Show" When we started in Season 1 I sat down and made an outline of where I want the show to go over the course of the first few seasons. Now, being a web series this altered quite a bit and looking back at Season 1 (Which I consider more of a test now more than anything) We didn't even really follow that outline. Since each episode was about 10-15 minutes, the scripts were roughly 20 pages each. We just started Season 2, we release one episode a month on the 30th, Except for this month of course.
I also film a second web series on my website, "The Report" which is a 15 minute long twice a month "Daily Show/SNL" type deal. It's a bunch of comedy sketches, a comedy monologue with a host at the beginning, and usually ends with a music video of sorts. For that we write each skit individually, and act them out to make sure we have the correct timing on each. We filmed 4 Report episodes in 2011, since we started in November. We have it on hold right now, because we are completely redoing the set. (Adding TVs in the back, a better desk, custom mugs, etc) We'll return with that in April.
Writing for a webseries is very fun, but also extremely time consuming haha, good luck!