Maybe Flixter or Netflix. Hope that helps!
On YouTube, you can search for them. Just make sure the video duration is above 40 minutes.
You can watch Gossip Girl episodes for free on www.GossipGirlCrazy.piczo.com on the 'episodes' page =)
you can watch them on hulu
You can watch some episodes on Nickelodeon's website, they change them periodically. Also, YTV.com has a few episodes.
you can watch it from 1channel.ch
you can watch it on youtube or hulu
You can watch free Pokemon episodes on Cartoon Network, Boomerang, or Pokemon.com! Pokemon.com is the best because you can watch almost all the episodes!!
You can watch it on the app crunchyroll but you can't watch any past episodes only the newest episodes
youtube
surfthehchannel.com
Hulu