Because there hasn't been any new episodes since 11/23/10. A new episode airs this Tuesday 12/14/2010, Season 8, Episode 10 - False Witness
CBS.com has full episodes of NCIS.
You can buy seasons 1-9 at any good music/ DVD store, depending on where you live. In some countries, the episodes are available through video rental services. In the US, they are available through NetFlix and Blockbuster.
You can buy the box set
Try casttv.com. It has every episode of ncis including season 8.
on http://www.cbs.com/primetime/ncis/video/
fancast.com or u cant if you look at list of episodes its not listed like they deleted it
You can watch episodes on DVD.
you can watch full episodes on projectfree tv. slow loading time but at least you can watch them.
Hulu is one option for free full TV episodes. Also, television networks are posting more and more full episodes, bonus episodes and extra footage on their individual network websites.
ytv.com
You can watch them at animeseason.com
You can watch full episodes of Adventure Time on Cartoon Network.